JOURNAL AND PROCEEDINGS. 31 
Extract relating to Barton Niagara beds from another source. 
GUELPH FAUNA (Clarke & Rudeman). 
SOUTHERN ONTARIO—SECTION AT HAMILTON. 
“The composition of the Niagara escarpment, which is finely 
continued along Lake Ontario (Hamilton Bay), just south of the 
City of Hamilton, has been carefully studied by Col. C. C. Grant, 
of that place, who has published various data in regard to it. Dr. 
J. W. Spencer also some years ago studied this region stratigraphi- 
cally, and described some of the fossils therefrom. From these 
sources we gather that the section here is the following, beginning 
at the top: The Barton bed (Spencer), summit formation mostly 
dark dolomite with interbedded shale and soft hydraulic layers, the 
latter considerably employed in the manufacture of cement, 87 feet ; 
Magnesian Silicious beds filled with irregular nodules of light or 
white chert, 20 feet maximum; Blue Dolomite, 5 feet 6 in.; 
Rochester Shale, 17 feet, 6 in. For our immediate use we need not 
carry the section further down, though the outcrop of the deposits 
extends well into the Medina, as on the Niagara river. To return 
to No. 1: these heterogeneous strata, consisting of shales, soft 
water-limes and hard dolomites (Barton beds) contain distinct 
faunas. In the hydraulic layers are ‘“‘ Atrypa reticularis,” ‘ Enteno- 
lasma Caliculus,” while the dark dolomites bear a distinct associa- 
tion. With the aid of Colonel Grant, and by the study of his 
collection and that of the Hamilton Scientific Association, we are 
able to cite these as characteristic species: ‘‘Orthorites Subplanus,” 
“‘Lepteena Rhomboidalis,” ‘‘ Orthoceras Bartonense” (Spencer), a 
‘“* Dawsonoceras,” identical with ‘‘ Dawson Annulatum.” More im- 
portant, however, are the following, each of which has been seen by 
Col. Grant in but a single specimen: “ Pleurotomaria perlata,” “Cceli- 
dium Macrospira,” “ Trochoceras,” like ‘‘T. Waldronense,” of the 
Waldron. The first two of these are of distinctively Guelph charac- 
ter, and ‘‘P. perlata” has not been found outside that fauna. Col. 
Grant finds that the upper layer of these Barton beds, whenever 
stripped of soil, is everywhere deeply scored by glacial shearing, and 
believes that some part of the dolomites has been carried away. 
