more to previous? oldest rockin ny, 250m sounds about right so, would that be metamorphic rock?

Question

that or sedimentary, and from the alleghenian orogeny? the more i look the more confused im getting. formed from marine sediment pushed up by continental collisions?

Answer 1

The Adirondack Mountains form most of northern New York state. They are an uplifted complex of Precambrian metamorphic rocks-see map here: http://tapestry.usgs.gov/features/03adirondack.html

There are many Precambrian (Proterozoic) rock units in New York-:
Unit: Adirondack
Unit: Alexandria Bay
Unit: Allens Falls
Unit: Austerlitz
Unit: Baldface Hill
Unit: Bernhardt Mountain
Unit: Black Lake
Unit: Blue Mountain Lake
Unit: Bomoseen
Bomoseen Graywacke (NY)
Unit: Brant Lake
Unit: Bull
Unit: Byram
Unit: Canada Hill
Unit: Canada Lake
Unit: Cat Hill
Unit: Catamount
Unit: Cedar River
Unit: Cranberry Lake
Unit: Diana
Unit: Eagle Lake
Unit: Everett
Unit: Fordham
Unit: Franklin
Unit: Gouverneur
Unit: Grenville
Unit: Hermon
Unit: Hyde School
Unit: Irving Pond
Unit: Jackson Summit
Unit: Kimball Corners
Unit: Lake Durant
Unit: Lake George
Unit: Little Moose Mountain
Unit: Losee
Unit: Lyon Mountain
Unit: Maple Ridge
Unit: Marble City
Unit: Mettawee
Unit: Mount Eve
Unit: Nassau
Unit: Oswegatchie
Unit: Paradox Lake
Unit: Peck Lake
Unit: Pharaoh Mountain
Unit: Piseco
Unit: Pleasant Lake
Unit: Poplar Hill
Unit: Popple Hill
Unit: Pound Ridge
Unit: Rensselaer
Rensselaer Graywacke (NY*,VT*)
Unit: Reservoir
Unit: Rooster Hill
Unit: Royal Mountain
Unit: Sacandaga
Sacandaga Formation (NY)
Unit: Springhill Pond
Unit: Stark
Unit: Storm King
Unit: Thunderbolt Mountain
Unit: Tomany Mountain
Unit: Treadway Mountain
Unit: Trumbull
Unit: Truthville
Unit: Vernon
Unit: West Castleton
Unit: Wildcat
Unit: Yonkers
Unit: Zion Hill
If you want more information on a particular unit, go to the website below and do a search.-it will link you to additional information about each.
Proterozoic: 2500million to 542 million years old.

Answer 2

Looking at the answers toyour previous question, I would have to say sedimentary because of the fossils and the time period of the Upper Ordivician. However 250 million is not correct the ordivician was between 488 mya and 444 million years ago. But sedimentary would still be correct.