206 REPORT OF THE AMERICAN COMMITTEE. 
satisfactory base for the Carboniferous system. My recent stu- 
dies of the fishes of the Chemung and Waverly have confirmed 
me in the conviction that the Chemung should be accepted as the 
base of the Carboniferous. 
I enclose a table which embodies my ideas in regard to the 
classification of our Paleozoic rocks. 
In great haste, but very truly yours, 
J. S. Newberry. 
Classification of the Paleozoic Rocks of North 
America suggested by J. S. Newberry. 
Carhoniferous System. 
{Permian. 
Coal measures. 
Millstone grit, 
f Chester beds. 
Middle Carboniferous (Carb. Lime- : St. Louis beds, 
stone Group), 1 Keokuk beds. 
[ Burlington beds. 
{\ V averly 
Catskill (local, lacustrine). 
Chemung. 
Devonian System. 
{ Portage shales. 
I Genesee shales. 
Upper Devonian (Hamilton Group), "^ tt u \ ^ it ^ 
" ^ r/j Hamilton shales and limestone. 
[ Marcellus shale. 
iCorniferous limestone. 
Onondaga limestone. 
Scoharie grit and limestone, 
f Cauda-galli grit. 
Lower Devonian (Oriskany Group), | Qriskany sandstone. 
Silurian System. 
f Upper Pent, limestone. 
Scutella limestone. 
Upper Silurian (Helderberg Group), i ^ ^^ 
I Lower Pent, limestone. 
I Water lime. 
Salina, local, lacustrine. 
f Niagara limestone. 
Middle Silurian (Niagara Group), J '&''♦• 
Clinton limestone. 
[ Clinton shale, 
f Medina sandstone. 
Lower Silurian (Medina Group), | q^^-^^ conglomerate. 
