3i6 
The American Geologist. 
November, 1903. 
and from the low cliffs on lake Erie, where the shore at Avon 
point is constantly cut away by the waves, Mr. Terrell collected 
those strange forms which the late Dr. Newberry made known 
to the scientific world. Led at first to a false inference con- 
cerning the horizon on account of the similarity of the rock and 
its fossils to these others he referred the beds to the Huron 
shale and correlated the fossils with Dinichthys hertzeri anci 
its contemporaries. But later research has shown that the 
strata belong at the top of the great shale and that their Din- 
ichtliys is not D. hertzeri; it has accordingly been named D. 
terrelli. Of this great fish, most of the armour plates of the 
head and many of those of the body are now known, and con- 
siderable progress has been made with its reconstruction. 
Section of the Cleveland Shale in Cuyahoga County. 
Large Cladodus. 
Dinichthys terrelli. 
Gorgonichthys. 
Titanichthys. 
Titanichthys clarki, T. rectus. 
Small Cladodus. 
Dinichthys intermedius, Titanichthys. 
D. intermedius. 
D. intermedius. 
U 
W 
10' 
8' 
15' 
8' 
Coccosteus. 
No fossils at Brooklyn, fossils on Rocky river. 
No fossils. 
Mr. Terrell's researches did not stop here. He rapidly add- 
ed to the fauna other equally novel forms, Mylostoma, Diplo- 
gnathus, Glyptaspis and Titanichthys, without mentioning nu- 
merous smaller and less striking species. In a few years an- 
