In 1992, a 308.6 m core to bedrock was drilled on the Guliya ice cap in the far western Kunlun Shan 
on the Qinghai-Tibetan Plateau, China. The core was recovered using an electromechanical drill 
in a dry hole to 200 m and a thermal drill with an alcohol-water mixture from 200 m to bedrock (308.6 m). 
No hiatus was observed in the core, and the visible layers were horizontal throughout. The entire length 
of the frozen core was analyzed by cutting 12,628 samples for oxygen isotopic (d18O) measurements, 
12,480 samples for dust concentrations, and 9,681 samples for anion Cl, NO3, and SO4 concentrations.

Guliya ice cap core location: 35°17'N, 81°29'E 6200m. above sea level

References:
Thompson, L.G., T. Yao, M.E. Davis, K.A. Henderson, E. Mosley-Thompson, P.N. Lin, J. Beer, H.-A. Synal, J. Cole-Dai, and J.F. Bolzan. 1997. 
Tropical climate instability: The last glacial cycle from a Qinghai-Tibetan ice core. 
Science, 276, 1821-25.

Thompson, L.G., E. Mosley-Thompson, M.E. Davis, P.-N. Lin, K. Henderson, and T.A. Mashiotta. 2003. 
Tropical glacier and ice core evidence of climate change on annual to millennial time scales. 
Climatic Change, 59, 137-155.

Thompson, L.G., E. Mosley-Thompson, H. Brecher, M. Davis, B. Leon, D. Les, P.-N. Lin, T. Mashiotta and K. Mountain. 2006. 
Abrupt tropical climate change: Past and present. 
Proceedings of the National Academy of Sciences, Vol. 103, No. 28, pp. 10536-10543, 11 July, 2006. DOI: 10.1073/pnas.0603900103