The Elements of Geology; Adapted to the Use of Schools and Colleges

by Justin R. Loomis

In what localities is it found?

What explanation, in reference to these rocks, is given by those who deny that they constitute a distinct system?

Fig. 9.

Fig. 10.

In what respects does the State of New York present the best facilities for studying the Silurian system?

Describe the Champlain division.

Fig. 11.

The Ontario division.

The Helderberg division.