Featured Posts

1/2

When LI Sound Was A Lake


Sometime around 19,000 years ago, Long Island Sound was a freshwater lake! Had you, at the time, been able to walk its beaches, you might have seen icebergs floating on its surface and its waters clouded by fine glacial sediments. As the lake grew, it evolved into what would become an important waterway and a rich estuarine (mix of fresh and salt water) habitat for marine life. Canadian glaciers covered parts of North America at least 16 times over the earth’s early history. Some 85,000 or more years ago, the last glacier, the Laurentide Ice Sheet, had spread across most of Canada. Reaching Wisconsin some 31,500 years ago, it became known as the Wisconsinan Glacier. From there, its ice advanced southward eventually reaching the Missouri and Ohio Rivers. At some northerly locations, its thickness is believed to have attained a height of about 6,000-7,000 feet (1.3 miles)! The glacier covered most of northern New England including Connecticut, Rhode Island and Massachusetts. Ice over Hartford was estimated to have been about 2,500 feet thick; New Haven’s was about 1,800 feet thick. Sheet ice is also said to have managed to cover New Hampshire’s Mt Washington, standing at 6,288 feet above sea level! In the meantime, the glacier spread across parts of Long Island where its remnants, called terminal moraine, marked the extent of glacial ice. One possible relic of the glacier, a nearly one and half+-story tall boulder, stands at the north-west corner of Smithtown Bay, New York. Other massive boulders lie submerged in Long Island Sound, with some located just offshore of Long Island. In Block Island Sound, a 16 to 20+ feet tall boulder is frequently explored by scuba divers. The rocks serve as habitat for some of the area’s fascinating marine creatures. As they advanced across North America, the glaciers bulldozed larg


1/10
Recent Posts
Archive
Search By Tags
Follow Us
  • Facebook Basic Square
  • Twitter Basic Square
  • Google+ Basic Square
Copyright 2016 Long Island Boating World. All Rights Reserved.