ニューヨーク・タイムズのインスタグラム(nytimes) - 6月6日 02時02分

At the start of the last ice age, 2.6 million years ago, a sheet of frozen water formed atop North America that kept expanding and thickening until it reached a maximum depth of roughly 2 miles. The ancient sheet of ice also left its mark on a very modern phenomenon: New York City. The ice over Manhattan, which would have buried even the tallest skyscraper, was so heavy that it depressed the underlying bedrock. As it melted, giant boulders embedded deep within its flanks landed throughout what became the city. (You can still see some of them in Central Park, where @george_etheredge took this photo of Umpire Rock. Its distinctive grooves were formed by glacial ice and rubble.) The mammoth sheet of ice ended immediately to the south, in Brooklyn, Queens and Staten Island. The mounds of rubble left behind form much of their high ground. Today, many city neighborhoods take their names from the ridge’s elevations, as well as its leafy embellishments: Glen Oaks, Hollis Hills, Jamaica Hills, Briarwood, Forest Hills, Ridgewood, Cypress Hills, Crown Heights, Prospect Heights, Boerum Hill, Cobble Hill, Park Slope, Greenwood, Bay Ridge, Lighthouse Hill and Arden Heights. Why should remnants of the last ice age be so prominent here, of all places? Visit the link in our profile to read more.

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