Earth today resides in a warm state with small ice caps, but geologic evidence suggests that the Neoproterozoic Earth, about 500 Myr ago, may have been frozen all the way down to the equator. (haqqmisra.net)
In this text, mountain glaciers exclude the large ice sheets of Greenland and Antarctica and the surrounding smaller ice caps. (nsidc.org)
What he did not expect to find was a hole twice the size of Central Park in a small ice cap in the northern reaches of Greenland. (scientificamerican.com)