The Dry Line

These rock outcroppings in Central Park are quiet reminders that at one time – 18,000 years ago – there was over 2,000 feet of solid ice sitting on top of New York. That’s higher than any skyscraper. The stone was etched and polished by glaciers during the last Ice Age. Since so much of the … Continue reading The Dry Line

King Tide

10,000 years ago San Francisco Bay was a dry grassy valley populated by elephants, zebras, and camels. The planet was significantly cooler and dryer back then. Sea level was lower since glaciers in the north pulled water out of the oceans. The bay isn’t that deep so a relatively small change in sea level pushed … Continue reading King Tide