# Illinois Pleistocene Gastropod Amino Acid Racemization Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # # Online_Resource: http://ncdc.noaa.gov/paleo/study/17224 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/aar/grimley2015illinois/grimley2015illinois.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Other Collections #-------------------- # Contribution_Date # Date: 2014-09-25 #-------------------- # Title # Study_Name: Illinois Pleistocene Gastropod Amino Acid Racemization Data #-------------------- # Investigators # Investigators: Grimley, D.A.; Oches, E.A. #-------------------- # Description_and_Notes # Description: D/L aspartic acid and glutamic acid in terrestrial gastropod genera Hendersonia, Succinea, Pomatiopsis in Pleistocene glacigenic sediments in Illinois. #-------------------- # Publication # Authors: David A. Grimley and Eric A. Oches # Published_Date_or_Year: 2015-02-01 # Published_Title: Amino acid geochronology of gastropod-bearing Pleistocene units in Illinois, central USA # Journal_Name: Quaternary Geochronology # Volume: 25 # Edition: # Issue: # Pages: 10-25 # DOI: 10.1016/j.quageo.2014.08.003 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S1871101414000776 # Full_Citation: # Abstract: Amino acid racemization (AAR) values measured in gastropod shells are demonstrated to be an important aid for correlations and chronology of fossiliferous loessal, lacustrine, and alluvial Pleistocene units in Illinois, central USA. Aspartic acid (Asx) and Glutamic acid (Glx) D/L values were analyzed on a total of 167 Succinea, Hendersonia, and Pomatiopsis shells from 9 geologic units, with clear stratigraphic relationships, at a total of 18 localities in central and southern Illinois. AAR data from Hendersonia and Succinea are less variable and more normally distributed than Pomatiopsis data, but the latter are locally useful for units lacking preferred genera. Based on analysis of variance tests, Asx- and Glx-D/L data can confidently distinguish among Wisconsin Episode (MIS 2-3), Illinois Episode (MIS 6), late pre-Illinois Episode (MIS 8-14), and early pre-Illinois Episode (MIS 20) deposits. Last glacial Peoria Silt (MIS 2) and Roxana Silt (MIS 3), have mean Asx-D/L values of 0.34-0.37 and 0.42-0.43, respectively, considering all genera. The Illinois Episode Petersburg Silt (~150 ka) has Asx-D/L (X: 0.50-0.56) and Glx- D/L (X: 0.17-0.22) ratios that are statistically distinctive from other units. Three late pre-Illinois Episode units (Harkness Silt Member, Belgium Member, and Banner silt units) have similar Asx D/L values (X: 0.63-0.71) and, along with stratigraphic context, confirm extensive middle Pleistocene glaciations in the region. Using parabolic kinetic age models, depositional ages of ~550-250 ka (MIS 14-8) are implied for these units, with a favored correlation with MIS 12 (~450 ka), a time of especially high global ice volume. The Canteen member, a preglacial alluvium-colluvium below the Harkness Silt, is statistically indistinguishable from other pre-Illinois Episode units with AAR data, but was likely deposited during ~660-480 ka (MIS 16 or 14), based on parabolic age estimates. The paleomagnetically reversed County Line silt (~780-830 ka: MIS 20), with the highest mean AAR values, is the oldest known gastropod-bearing Pleistocene unit in Illinois. #------------------ # Funding_Agency # Funding_Agency_Name: Illinois State Geological Survey # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: University of South Florida # Grant: #------------------ # Site_Information # Site_Name: Powdermill Creek Section # Location: North America>United States Of America>Illinois # Country: United States Of America # Northernmost_Latitude: 38.55606 # Southernmost_Latitude: 38.55606 # Easternmost_Longitude: -90.08795 # Westernmost_Longitude: -90.08795 # Elevation: m #------------------ # Data_Collection # Collection_Name: Grimley2015AAR # Earliest_Year: 830000 # Most_Recent_Year: 150000 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology: # # #---------------- LABORATORY AND ANALYTICAL INFORMATION Lab history "University of South Florida (FAL), Bentley University (BEN)" Lab PI "Oches, Eric A." Preparation date 2/5/1999 - 6/1/2009 Pretreatment ultrasonic rinse in ultra-pure H2O AA fraction THAA Hydrolysis procedure 22 hr at 110°C in 6 M HCl under N2 Bleach none Analytical method RPLC Instrumental programming Area or height ratio Area Blank corrections Response factors Data screening criteria "Anomalous serine; D/L Asx, Glu > 2x standard deviation; poorly resolved peaks" Interlab comparisons ILCs SAMPLE LOCATION INFORMATION Country or ocean USA State or province or sea Illinois Locality descriptors = SITE NAME Locality descriptors Lat (°) = LAT (°) Lon (°) = LON (°) Coordinate precision Datum "Elevation, m" Elevation precision SAMPLE MATERIAL AND CONTEXT Material type gastropod shell Genus = GENUS Species = SPECIES Number of individuals Field context terrestrial Field context outcrop Field context stratified section Collection date various: 1950s (museum specimens) - 2008 Collector "Grimley, D.A.; Oches, E.A.; Leonard, A.B." Sample PI "Oches, E.A." Stratigraphic unit or age = UNIT Stratigraphic unit or age = AGE Numerical age Field ID = SAMPLE/DEPTH (FT) Field ID 1 Field ID 2 Sample ID Fraction of shell whole shell Sample position RESULTS Lab code = LAB ID Lab ID = LAB # + SHELL Number of chromatograms = N Sample or analytical qaulity AI = A/I Ala DL Asx DL = D/L ASX Glx DL = D/L GLX Leu DL Phe DL = D/L PHE Pro DL Ser DL Val DL = D/L VAL Free field 1 = SD ASX Free field 2 = SD GLX Free field 3 = SD VAL Free field 4 = SD PHE Free field 5 = SD A/I DATA: 1. Summary Data from Table 2 Episode Unit Genus N Asp DL Asp SD Glu DL Glu SD Wisconsin Peoria Silt Hendersonia 10 0.34 0.03 0.08 0.01 Wisconsin Peoria Silt Succinea 31 0.37 0.03 0.1 0.02 Wisconsin Roxana Silt Hendersonia 8 0.43 0.06 0.09 0.02 Wisconsin Roxana Silt Succinea 2 0.42 0.02 0.14 0.01 Wisconsin Equality Fm. Succinea 3 0.46 0.01 0.15 0.01 Wisconsin Equality Fm. Pomatiopsis 5 0.43 0.01 0.13 0.01 Illinoian Petersburg Silt Hendersonia 8 0.52 0.05 0.17 0.04 Illinoian Petersburg Silt Succinea 9 0.56 0.04 0.22 0.04 Illinoian Petersburg Silt Pomatiopsis 28 0.5 0.07 0.2 0.04 Pre-Illinoian Harkness Silt Hendersonia 4 0.63 0.06 0.27 0.02 Pre-Illinoian Harkness Silt Succinea 12 0.7 0.05 0.38 0.04 Pre-Illinoian Harkness Silt Pomatiopsis 3 0.71 0.06 0.36 0.05 Pre-Illinoian Belgium Member Hendersonia 8 0.68 0.04 0.38 0.02 Pre-Illinoian Belgium Member Succinea 3 0.66 0.05 0.4 0.06 Pre-Illinoian Belgium Member Pomatiopsis 3 0.64 0.06 0.44 0.06 Pre-Illinoian Banner Fm. Silt Hendersonia 6 0.7 0.05 0.35 0.05 Pre-Illinoian Banner Fm. Silt Succinea 9 0.71 0.04 0.4 0.03 Pre-Illinoian Canteen member Hendersonia 1 0.79 - 0.49 - Pre-Illinoian Canteen member Pomatiopsis 9 0.68 0.16 0.43 0.13 Pre-Illinoian County Line silt Hendersonia 3 0.82 0.06 0.59 0.09 Pre-Illinoian County Line silt Pomatiopsis 2 0.74 0.08 0.59 0.05 2. Sample AAR Data Site Name Lat (°N) Lon (°W) Sample/Depth (ft) Unit Age Genus Species Lab ID Lab # Shell N D/L Asx. SD Asx D/L Glx. SD Glx D/L Val. SD Val D/L Phe. SD Phe A/I SD A/I Alton Quarry 38.90064 90.20275 grab sample Petersburg Silt Illinois Ep. Hendersonia occulta FAL 112 A 2 0.469 0.003 0.166 0.030 0.431 0.030 0.097 0.011 Alton Quarry 38.90064 90.20275 grab sample Petersburg Silt Illinois Ep. Hendersonia occulta FAL 112 B 2 0.511 0.006 0.215 0.024 0.502 0.040 0.124 0.001 Alton Quarry 38.90064 90.20275 grab sample Petersburg Silt Illinois Ep. Hendersonia occulta FAL 112 C 1 0.554 0.172 0.533 0.155 Powdermill Creek Sect. 38.55606 90.08795 99PC-1 (grab sample) Petersburg Silt Illinois Ep. Hendersonia occulta FAL 334 A 1 0.570 0.240 Powdermill Creek Sect. 38.55606 90.08795 99PC-3 (grab sample) Petersburg Silt Illinois Ep. Hendersonia occulta FAL 341 A 1 0.526 0.152 0.410 Powdermill Creek Sect. 38.55606 90.08795 99PC-3 (grab sample) Petersburg Silt Illinois Ep. Hendersonia occulta FAL 341 B 1 0.517 0.131 0.348 Powdermill Creek Sect. 38.55606 90.08795 99PC-3 (grab sample) Petersburg Silt Illinois Ep. Hendersonia occulta FAL 341 C 1 0.583 0.179 0.470 Prairie du Pont Sect. 38.52255 90.10945 grab sample Petersburg Silt Illinois Ep. Hendersonia occulta FAL 118 A 3 0.450 0.021 0.127 0.009 0.418 0.012 0.099 0.011 Core FRV-1 38.52884 90.12077 95 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 192 A 1 0.476 0.171 0.186 Core FRV-1 38.52884 90.12077 95 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 192 B 1 0.504 0.182 0.136 Core FRV-1 38.52884 90.12077 95 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 192 C 1 0.512 0.179 0.152 Core FRV-2 38.52884 90.12077 123 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 194 A 1 0.509 0.198 0.130 Core FRV-2 38.52884 90.12077 123 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 194 B 1 0.502 0.177 0.117 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 B 1 0.551 0.171 0.338 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 C 1 0.581 0.198 0.370 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 D 1 0.569 0.189 0.443 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 E 1 0.468 0.202 0.396 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 F 1 0.532 0.219 0.457 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 G 1 0.495 0.194 0.399 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 H 1 0.518 0.220 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 338 I 1 0.672 0.246 0.431 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 339 A 1 0.589 0.169 0.375 Prairie du Pont Sect. 38.52255 90.10945 99PDP-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 325 A 1 0.406 0.150 Prairie du Pont Sect. 38.52255 90.10945 99PDP-2 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 326 A 1 0.513 0.196 Prairie du Pont Sect. 38.52255 90.10945 99PDP-3 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 330 A 1 0.395 0.176 Prairie du Pont Sect. 38.52255 90.10945 99PDP-3 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 330 B 1 0.405 0.139 Prairie du Pont Sect. 38.52255 90.10945 99PDP-3 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 330 C 1 0.389 0.176 Prairie du Pont Sect. 38.52255 90.10945 99PDP-4 (grab sample) Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 332 A 1 0.494 0.233 Robbins Core 38.64144 89.99698 75.5 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 736 A 2 0.339 0.005 0.129 0.006 0.078 0.004 0.228 0.004 0.118 0.016 Robbins Core 38.64144 89.99698 80 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 739 A 2 0.420 0.010 0.179 0.007 0.094 0.006 0.371 0.000 0.141 0.009 Robbins Core 38.64144 89.99698 80 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 739 B 2 0.545 0.011 0.279 0.004 0.090 0.021 0.561 0.030 0.185 0.033 Robbins Core 38.64144 89.99698 80 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 739 C 2 0.546 0.001 0.263 0.008 0.131 0.017 0.482 0.010 0.201 0.029 Robbins Core 38.64144 89.99698 84.4 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 741 A 2 0.467 0.001 0.198 0.014 0.108 0.008 0.397 0.023 0.190 0.048 Robbins Core 38.64144 89.99698 84.4 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 741 B 2 0.466 0.014 0.220 0.012 0.121 0.004 0.405 0.027 0.175 0.006 Robbins Core 38.64144 89.99698 82.5 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 829 A 1 0.598 0.258 0.187 0.179 Robbins Core 38.64144 89.99698 82.5 ft. depth Petersburg Silt Illinois Ep. Pomatiopsis sp. FAL 829 B 1 0.528 0.190 0.159 0.151 Powdermill Creek Sect. 38.55606 90.08795 grab sample Petersburg Silt Illinois Ep. Succinea sp. FAL 110 A 5 0.550 0.003 0.218 0.021 0.643 0.042 0.259 0.079 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Succinea sp. FAL 336 A 1 0.605 0.227 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Succinea sp. FAL 336 B 1 0.598 0.235 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Succinea sp. FAL 336 D 1 0.523 0.147 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Succinea sp. FAL 336 E 1 0.614 0.231 Powdermill Creek Sect. 38.55606 90.08795 99PC-2 (grab sample) Petersburg Silt Illinois Ep. Succinea sp. FAL 336 F 1 0.544 0.209 Prairie du Pont Sect. 38.52255 90.10945 99PDP-1 (grab sample) Petersburg Silt Illinois Ep. Succinea sp. FAL 323 A 1 0.493 0.173 Robbins Core 38.64144 89.99698 80 ft. depth Petersburg Silt Illinois Ep. Succinea sp. FAL 738 A 2 0.574 0.002 0.236 0.008 0.683 0.010 0.238 0.004 Robbins Core 38.64144 89.99698 84.4 ft. depth Petersburg Silt Illinois Ep. Succinea sp. FAL 740 A 2 0.523 0.001 0.263 0.013 0.667 0.036 0.203 0.013 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 889 A 1 0.689 0.418 0.511 0.858 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 889 B 1 0.631 0.392 0.420 0.777 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 893 A 1 0.681 0.362 0.460 0.814 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 893 B 1 0.654 0.346 0.480 0.763 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 893 C 1 0.629 0.356 0.417 0.771 Danville Strip Mine B 40.14757 87.71321 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 892 A 1 0.701 0.399 0.440 0.855 Danville Strip Mine B 40.14757 87.71321 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 892 B 1 0.697 0.371 0.526 0.846 Danville Strip Mine B 40.14757 87.71321 grab sample Belgium Silt pre-Illinois Ep. Hendersonia occulta FAL 892 C 1 0.728 0.396 0.556 0.892 Robbins Core 38.64144 89.99698 172.75 ft. depth Canteen Member pre-Illinois Ep. Hendersonia occulta FAL 751 A 2 0.793 0.011 0.487 0.018 Big Sister Section 40.43398 90.08602 grab sample Banner Fm. silt pre-Illinois Ep. Hendersonia occulta FAL 885 A 1 0.733 0.385 0.431 0.844 Big Sister Section 40.43398 90.08602 grab sample Banner Fm. silt pre-Illinois Ep. Hendersonia occulta FAL 885 B 1 0.688 0.356 0.357 0.825 Big Sister Section 40.43398 90.08602 grab sample Banner Fm. silt pre-Illinois Ep. Hendersonia occulta FAL 885 C 1 0.598 0.309 0.275 0.707 Long Lake Section 40.15536 90.3368 grab sample Banner Fm. silt pre-Illinois Ep. Hendersonia occulta FAL 886 A 2 0.701 0.032 0.283 0.004 0.332 0.003 0.774 0.008 Long Lake Section 40.15536 90.3368 grab sample Banner Fm. silt pre-Illinois Ep. Hendersonia occulta FAL 886 B 1 0.726 0.327 0.338 0.815 Long Lake Section 40.15536 90.3368 grab sample Banner Fm. silt pre-Illinois Ep. Hendersonia occulta FAL 886 C 1 0.750 0.417 0.388 0.875 Robbins Core 38.64144 89.99698 142 ft. depth Harkness Silt pre-Illinois Ep. Hendersonia occulta FAL 744 A 2 0.664 0.011 0.255 0.003 0.296 0.008 0.730 0.025 Robbins Core 38.64144 89.99698 142 ft. depth Harkness Silt pre-Illinois Ep. Hendersonia occulta FAL 744 B 1 0.554 0.242 0.301 0.688 0.321 Robbins Core 38.64144 89.99698 142 ft. depth Harkness Silt pre-Illinois Ep. Hendersonia occulta FAL 744 C 2 0.620 0.011 0.286 0.008 0.289 0.017 0.706 0.025 0.318 0.004 Robbins Core 38.64144 89.99698 150 ft. depth Harkness Silt pre-Illinois Ep. Hendersonia occulta FAL 833 A 1 0.698 0.280 0.406 0.317 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Pomatiopsis sp. FAL 890 A 1 0.604 0.392 0.373 0.705 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Pomatiopsis sp. FAL 890 B 1 0.598 0.414 0.374 0.770 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Pomatiopsis sp. FAL 890 C 1 0.703 0.501 0.473 0.832 Robbins Core 38.64144 89.99698 172.5 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 749 A 2 0.487 0.009 0.266 0.008 0.136 0.001 0.386 0.013 0.239 0.001 Robbins Core 38.64144 89.99698 172.5 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 749 B 2 0.748 0.049 0.572 0.006 0.381 0.022 0.644 0.115 0.541 0.033 Robbins Core 38.64144 89.99698 172.5 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 749 C 2 0.561 0.011 0.307 0.004 0.208 0.004 0.299 0.013 Robbins Core 38.64144 89.99698 172.75 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 752 A 2 0.660 0.045 0.460 0.007 0.230 0.023 0.738 0.086 Robbins Core 38.64144 89.99698 172.75 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 752 B 2 0.644 0.011 0.367 0.011 0.229 0.007 0.532 0.041 0.343 0.016 Robbins Core 38.64144 89.99698 172.75 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 752 C 2 0.450 0.011 0.261 0.011 0.187 0.004 0.371 0.015 Robbins Core 38.64144 89.99698 172.5 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 835 A 1 0.873 0.557 0.495 0.447 Robbins Core 38.64144 89.99698 172.5 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 835 B 1 0.813 0.517 0.481 0.453 Robbins Core 38.64144 89.99698 172.5 ft. depth Canteen Member pre-Illinois Ep. Pomatiopsis sp. FAL 835 C 1 0.873 0.544 0.482 0.452 Core EVC-1 38.85476 89.97441 116.6 ft. depth Harkness Silt pre-Illinois Ep. Pomatiopsis lapidaria BEN 2560 A 1 0.697 0.370 0.278 0.606 0.273 Core EVC-1 38.85476 89.97441 116.6 ft. depth Harkness Silt pre-Illinois Ep. Pomatiopsis lapidaria BEN 2560 B 1 0.658 0.298 0.248 0.579 0.341 Core EVC-1 38.85476 89.97441 116.6 ft. depth Harkness Silt pre-Illinois Ep. Pomatiopsis lapidaria BEN 2560 C 1 0.768 0.401 0.343 0.809 0.323 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Succinea sp. FAL 891 A 1 0.644 0.405 0.395 0.767 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Succinea sp. FAL 891 B 1 0.722 0.455 0.498 0.891 Harmattan Strip Mine A 40.14437 87.72274 grab sample Belgium Silt pre-Illinois Ep. Succinea sp. FAL 891 C 1 0.616 0.335 0.466 0.757 Robbins Core 38.64144 89.99698 142 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 742 A 2 0.702 0.004 0.414 0.028 0.256 0.017 0.830 0.043 0.389 0.039 Robbins Core 38.64144 89.99698 142 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 742 B 2 0.637 0.009 0.376 0.012 0.238 0.020 0.750 0.028 0.292 0.023 Robbins Core 38.64144 89.99698 142 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 742 C 2 0.640 0.042 0.398 0.020 0.270 0.027 0.767 0.042 0.395 0.005 Robbins Core 38.64144 89.99698 146.5 ft. depth (B) Harkness Silt pre-Illinois Ep. Succinea sp. FAL 746 A 2 0.674 0.034 0.357 0.014 0.576 0.268 0.376 0.012 Robbins Core 38.64144 89.99698 146.5 ft. depth (B) Harkness Silt pre-Illinois Ep. Succinea sp. FAL 746 B 2 0.702 0.001 0.430 0.015 0.254 0.001 0.830 0.027 0.385 0.009 Robbins Core 38.64144 89.99698 146.5 ft. depth (B) Harkness Silt pre-Illinois Ep. Succinea sp. FAL 746 C 2 0.748 0.039 0.407 0.011 Robbins Core 38.64144 89.99698 146.5 ft. depth (A) Harkness Silt pre-Illinois Ep. Succinea sp. FAL 747 A 2 0.685 0.028 0.425 0.013 0.823 0.021 0.363 0.018 Robbins Core 38.64144 89.99698 144 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 831 A 1 0.717 0.371 0.360 0.365 Robbins Core 38.64144 89.99698 146.5 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 832 A 1 0.774 0.396 0.389 0.345 Robbins Core 38.64144 89.99698 146.5 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 832 B 1 0.680 0.302 0.322 0.325 Robbins Core 38.64144 89.99698 146.5 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 832 C 1 0.711 0.353 0.357 0.312 Robbins Core 38.64144 89.99698 150.75 ft. depth Harkness Silt pre-Illinois Ep. Succinea sp. FAL 834 A 1 0.773 0.387 0.358 0.439 CHAM-03-01 (Core) 40.08028 88.21894 173.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2566 A 2 0.675 0.011 0.397 0.009 0.351 0.000 1.019 0.075 0.275 0.008 CHAM-03-01 (Core) 40.08028 88.21894 173.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2566 B 1 0.684 0.355 0.381 0.820 0.298 CHAM-03-01 (Core) 40.08028 88.21894 176.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2567 A 1 0.747 0.459 0.411 0.865 0.423 CHAM-03-01 (Core) 40.08028 88.21894 176.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2567 B 1 0.751 0.370 0.257 0.890 0.322 CHAM-03-01 (Core) 40.08028 88.21894 178.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2568 A 1 0.750 0.450 0.386 1.007 0.354 CHAM-03-01 (Core) 40.08028 88.21894 178.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2568 B 1 0.738 0.383 0.398 0.889 0.539 CHAM-03-01 (Core) 40.08028 88.21894 178.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2568 C 1 0.696 0.405 0.360 0.805 0.361 CHAM-03-01 (Core) 40.08028 88.21894 178.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2568 D 1 0.735 0.396 0.410 0.827 0.495 CHAM-03-01 (Core) 40.08028 88.21894 178.5 ft. depth Banner Fm. silt pre-Illinois Ep. Succinea sp. BEN 2568 E 1 0.645 0.400 0.368 0.810 0.224 County Line Section 40.19999 91.41207 grab sample County Line Silt "pre-Illinois Ep., early" Hendersonia occulta FAL 1054 A 1 0.770 0.522 0.655 0.867 County Line Section 40.19999 91.41207 grab sample County Line Silt "pre-Illinois Ep., early" Hendersonia occulta FAL 1054 B 1 0.791 0.549 0.736 0.915 County Line Section 40.19999 91.41207 grab sample County Line Silt "pre-Illinois Ep., early" Hendersonia occulta FAL 1054 C 1 0.888 0.686 0.844 0.986 County Line Section 40.19999 91.41207 grab sample County Line Silt "pre-Illinois Ep., early" Pomatiopsis sp. FAL 1055 A 1 0.791 0.626 0.583 0.839 County Line Section 40.19999 91.41207 grab sample County Line Silt "pre-Illinois Ep., early" Pomatiopsis sp. FAL 1055 B 1 0.683 0.549 0.543 0.693 Burdick Branch Section 38.73391 90.00047 grab sample Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 1236 A 1 0.298 0.072 0.064 0.188 0.048 Burdick Branch Section 38.73391 90.00047 grab sample Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 1236 B 1 0.327 0.074 0.084 0.224 0.051 Burdick Branch Section 38.73391 90.00047 grab sample Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 1236 C 1 0.366 0.080 0.082 0.234 0.058 Keller Farm Section 38.74814 90.00275 0.0 m Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 312 A 1 0.356 0.073 0.184 Keller Farm Section 38.74814 90.00275 0.0 m Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 312 B 1 0.329 0.065 0.164 Keller Farm Section 38.74814 90.00275 0.0 m Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 312 C 1 0.320 0.068 0.184 Keller Farm Section 38.74814 90.00275 0.6 m Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 315 A 1 0.389 0.071 0.211 Thomas Quarry 39.52536 90.51554 2.35-2.45 m depth Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 127 A 1 0.347 0.094 0.204 0.043 Thomas Quarry 39.52536 90.51554 2.35-2.45 m depth Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 127 B 1 0.319 0.084 0.198 0.065 Thomas Quarry 39.52536 90.51554 2.35-2.45 m depth Peoria Silt Wisconsin Ep. Hendersonia occulta FAL 127 C 1 0.321 0.084 0.168 0.044 Pleasant Grove School 38.69176 90.00627 grab sample Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 1235 A 1 0.448 0.109 0.089 0.534 0.122 Pleasant Grove School 38.69176 90.00627 grab sample Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 1235 B 1 0.496 0.100 0.110 0.368 Pleasant Grove School 38.69176 90.00627 grab sample Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 1235 C 1 0.478 0.110 0.102 0.354 Pleasant Grove School 38.69176 90.00627 grab sample Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 1235 D 1 0.404 0.110 0.088 0.317 Schoolhouse Branch 38.68852 90.00657 3.2-3.4 m (upper sample) Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 303 A 1 0.463 0.083 0.250 Schoolhouse Branch 38.68852 90.00657 3.2-3.4 m (upper sample) Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 303 B 1 0.425 0.094 0.231 Schoolhouse Branch 38.68852 90.00657 6.1-6.3 m (lower sample) Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 307 A 1 0.429 0.072 0.233 Schoolhouse Branch 38.68852 90.00657 6.1-6.3 m (lower sample) Roxana Silt Wisconsin Ep. Hendersonia occulta FAL 307 B 1 0.316 0.076 0.171 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Pomatiopsis lapidaria FAL 1238 A 1 0.440 0.136 0.078 0.311 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Pomatiopsis lapidaria FAL 1238 B 1 0.429 0.140 0.078 0.320 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Pomatiopsis lapidaria FAL 1238 C 1 0.427 0.130 0.069 0.291 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Pomatiopsis lapidaria FAL 1238 D 1 0.422 0.125 0.068 0.252 0.138 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Pomatiopsis lapidaria FAL 1238 E 1 0.423 0.135 0.076 0.280 0.173 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Succinea ovalis FAL 1239 A 1 0.469 0.149 0.111 0.336 0.108 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Succinea ovalis FAL 1239 B 1 0.440 0.160 0.114 0.353 0.114 Big Ridge Section 37.72841 88.48034 grab sample Equality Formation Wisconsin Ep. Succinea ovalis FAL 1239 C 1 0.457 0.152 0.110 0.352 0.049 Burdick Branch Sect. 38.73391 90.00047 grab sample Peoria Silt Wisconsin Ep. Succinea grosvenori FAL 1237 A 1 0.370 0.131 0.059 0.298 Burdick Branch Sect. 38.73391 90.00047 grab sample Peoria Silt Wisconsin Ep. Succinea grosvenori FAL 1237 B 1 0.416 0.139 0.084 0.282 0.080 Burdick Branch Sect. 38.73391 90.00047 grab sample Peoria Silt Wisconsin Ep. Succinea grosvenori FAL 1237 C 1 0.392 0.127 0.086 0.281 0.063 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 A 1 0.369 0.089 0.203 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 B 1 0.350 0.093 0.226 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Succinea sp. FAL 309 C 1 0.359 0.096 0.228 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 D 1 0.341 0.093 0.211 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 E 1 0.372 0.075 0.194 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 F 1 0.349 0.091 0.184 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 G 1 0.425 0.109 0.232 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 H 1 0.414 0.094 0.214 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 I 1 0.353 0.107 0.217 Keller Farm Section 38.74814 90.00275 9.0-9.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 309 J 1 0.357 0.097 0.215 Keller Farm Section 38.74814 90.00275 11.05-11.15 m (lowermost) Peoria Silt Wisconsin Ep. Succinea sp. FAL 311 A 1 0.419 0.113 0.205 Keller Farm Section 38.74814 90.00275 11.05-11.15 m (lowermost) Peoria Silt Wisconsin Ep. Succinea sp. FAL 311 B 1 0.415 0.126 0.204 Keller Farm Section 38.74814 90.00275 11.05-11.15 m (lowermost) Peoria Silt Wisconsin Ep. Succinea sp. FAL 311 C 1 0.354 0.092 0.164 Keller Farm Section 38.74814 90.00275 0.0 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 313 A 1 0.363 0.096 0.167 Keller Farm Section 38.74814 90.00275 0.0 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 313 B 1 0.371 0.100 0.178 Keller Farm Section 38.74814 90.00275 0.0 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 313 C 1 0.365 0.100 0.173 Keller Farm Section 38.74814 90.00275 0.6 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 316 A 1 0.353 0.107 0.194 Keller Farm Section 38.74814 90.00275 0.6 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 316 B 1 0.284 0.071 0.158 Keller Farm Section 38.74814 90.00275 3.0 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 318 A 1 0.363 0.101 0.154 Keller Farm Section 38.74814 90.00275 3.0 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 318 B 1 0.374 0.126 0.195 Keller Farm Section 38.74814 90.00275 3.0 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 318 C 1 0.378 0.106 0.208 Keller Farm Section 38.74814 90.00275 3.0 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 318 D 1 0.341 0.109 0.204 Thomas Quarry 39.52536 90.51554 2.0-2.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 125 A 1 0.342 0.093 0.201 0.073 Thomas Quarry 39.52536 90.51554 2.0-2.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 125 B 1 0.353 0.096 0.214 0.066 Thomas Quarry 39.52536 90.51554 2.0-2.1 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 125 C 1 0.362 0.079 0.229 Thomas Quarry 39.52536 90.51554 2.35-2.45 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 126 A 1 0.430 0.068 0.237 0.054 Thomas Quarry 39.52536 90.51554 2.35-2.45 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 126 B 1 0.342 0.045 0.170 0.082 Thomas Quarry 39.52536 90.51554 2.35-2.45 m Peoria Silt Wisconsin Ep. Succinea sp. FAL 126 C 1 0.348 0.054 0.178 0.036 Schoolhouse Branch 38.68852 90.00657 3.2-3.4 m (upper sample) Roxana Silt Wisconsin Ep. Succinea sp. FAL 304 A 1 0.427 0.145 0.228 Schoolhouse Branch 38.68852 90.00657 3.2-3.4 m (upper sample) Roxana Silt Wisconsin Ep. Succinea sp. FAL 304 B 1 0.403 0.124 0.250