84 REVIEWS 
exception of the Salina beds and Cobleskill waterlime which are in the 
Upper Silurian. From an economic standpoint the Bertie waterlime at 
the top of the Salina beds is the most important division of the Silurian 
rocks, since it is extensively quarried in North Buffalo and Williamsville 
for the production of natural cement. Paleontologically, the Bertie water- 
lime is characterized by an “abundant and peculiar crustacean fauna’’ 
of lobster-like forms belonging in the extinct orders of Eurypterida and 
Phyllocarida. ‘The highest bed of the Upper Silurian in the Buffalo region, 
in somewhat earlier papers, had been referred either to the Onondaga or 
Manlius limestones, but recently has been correctly correlated by Hart- 
nagel with the Cobleskill limestone (formerly Coralline) of eastern New 
York. The Rondout waterlime and Manlius limestone of the Upper Silurian 
and the Helderbergian limestones of the Paleo-Devonian do not reach 
western New York, so that the oldest Devonian rocks rest unconformably 
by erosion upon the Cobleskill waterlime. The quartz sand filling the 
fissures in the Cobleskill waterlime, which infrequently extend down into 
the Bertie, is considered Oriskany sediment and, consequently, the oldest 
Devonian deposit. The oldest well-represented Devonian formation is 
the Onondaga limestone, with a thickness of about 160 feet, which is quar- 
ried extensively for building-stone and the production of quicklime. This 
limestone contains a considerable amount of carbonaceous matter, nodular 
layers of chert, and large numbers of fossils. 
The Onondaga limestone is followed by the Marcellus beds which are 
divided into the Marcellus black shale, representing the typical shales 
occurring at Marcellus, the Stafford limestone, and the Cardiff shale. The 
Hamilton beds are well shown at various localities on the southern part of the 
quadrangle and are divided in ascending order into the Skaneateles and 
Ludlowville shales, Tichenor limestone, and Moscow shale. Fossils are 
abundant in all of these divisions, with the exception of the lowest one— 
the Skaneateles shale. The Hamilton beds are succeeded by the Genesee 
beds of which the typical Genesee black shale is practically absent. 
The Genundewah limestone, an irregular concretionary stratum, I to 2 
feet thick, and the West River shale, about 12 feet in thickness, are well 
shown. The limestone in many places is composed largely of the shells 
of the minute Pteropod, Styliolina fissurella, and, on that account, has also 
been called the Styliola limestone. The Portage beds are the youngest ones 
described and on this quadrangle the subdivisions of the Middlesex black 
shale, the Cashaqua shale, and the Rhinestreet black shale occur. The 
two black shales of the Portage contain comparatively few fossils; but they 
are fairly common in the Cashaqua shale and its interbedded calcareous, 
concretionary layers. CSc 
