Covering Eastern New York State, Hudson Valley, Long Island
Timelines for similar periods for Western and Central New York can be found at
crookedlakereview.blogspot.com/
B. C. dates extremely approximate
1,100,000,000 B. C.
A shallow ocean deposits sediments that become Lake George bedrock.
520,000,000 B. C.
Shallow sea water at the western edge of the Iapetus sea lays down sandstone along the proto-Hudson River in the Ausable Chasm and Troy, New York, areas.
460,000,000 B. C.
The approach of the African continent causes the thrusting up of the Vermontia land mass, a period known as the Taconic Orogeny or the Greenville event. The Taconics, Berkshires, Adirondacks, Blue Ridge, and Green Mountains are created as a result.
450,000,000 B. C.
Pushed westward into New York, New England bedrock creates the Rensselaer Plateau.
North America
The central part of the land mass lies in the tropics. Today's east coast faces south and a chain of volcanic islands begins colliding with the coast. They will be submerged and compressed to become the bedrock beneath Long Island.
430,000,000 B. C.
The Taconic Orogeny period draws to a close.
60,000,000 B. C.
The Magothy aquifer, the third layer from the bottom of gravel, sand and silt beneath Long Island, is laid down by glacial action.
30,000,000 B. C.
The Jurassic Period. The Palisades are formed.
2,000,000 B. C.
The Kansan glaciation period begins in North America, lasts for about a million years. The ice begins advancing down the Champlain-Hudson valley.
22,000 B. C.
The last glacier, the Laurentide, reaches Long Island.
20,000 B. C.
North America's most recent glaciers begin retreating. At their zenith the northern half of Long Island is covered. ** The Allegheny River's bed is formed at the glacier's edge.
18,000 B. C.
The glacier begins receding from the Allegheny River. ** Glacial Lake Albany is formed by retreating glaciers.
17,500 B. C.
The retreating glacier leaves a long lake (Glacial Lake Connecticut) behind - the future Long Island Sound.
14,000 B. C.
The lake at the site of today's Long Island Sound dries up after the glacial ice sheet recedes.
13,000 B. C.
Rising seas begin breaking into the lengthy depression in the earth that will become Long Island Sound.
11,000 B. C.
Glacial Lake Albany dries out.
10,000 B. C.
Long Island becomes an island when waters break through on the western end to the interior lake. ** Nomadic hunters from the north begin entering the Long Island area.
9,070 B. C.
A mastodon dies in the Cohoes area.
8,000 B.C.
The future Lake Champlain is an inland sea.
6,000 B. C.
Deciduous plants make their appearance on Long Island.
4,500 B. C.
Cedar trees are traced back to this period at Montauk, Long Island.
4,000 B. C.
The use of pottery is widespread through the North American continent by this time. ** Artifacts of Native American tribes date back to this period at Magdalen Island, in the middle Hudson River.
3,500 B. C.
The approximate date the Laurentian Algonquins enter the state. The Lamoka subculture also begins forming around this time.
3,000 B. C.
The approximate date Indians, of the Algonquin tribes, begin spreading out across Long Island.
2,200 B. C.
Cedar trees grow on Long Island at Mashomack.
2,000 B. C.
The rate of the rise of sea level begins to slow. Marshes develop along the shores of Long Island. ** The Middle Woodland culture reaches the area.
© 2011 David Minor / Eagles Byte
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