what is the oldest type of rock exposed in new york state?

Question

This is for a geology class

Answer 1

The rocks in western New York are early Paleozoic in age and are overlain by glacial drift deposits.The sediments were deposited in the northwestern portion of the Appalachian Basin and are largely marine sediments deposited westward of thick delatic deposits.The area lies in the Appalachian Plateau; the formation outcrops are aligned in a general east-west direction and dip gently to the south.The oldest rocks (Upper Ordovician) outcrop along the shores of Lake Ontario; the youngest rocks are Upper Devonian-Lower Mississippian which occur along the Pennsylvania-New York border.

Answer 2

Some areas of Western New York 1.3 billion years.
Protozeroic

There are some features that may be drift from the Cambrian and pre-cambrian from the Canada Shield

Check out these maps:
http://jan.ucc.nau.edu/~rcb7/nam.html

in particular this one. Keep in mind the basics of geology that with time things change.
http://jan.ucc.nau.edu/~rcb7/namPC550.jpg

Answer 3

I've been fossil hunting in quarries with literally scads of trilobites and brachiopods. This puts a lower limit on the answer of about 250 million years.