28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Chazy group). The sequence is best displayed on Valcour Island, N. Y., but 
good sections are also known at Crown Point, N. Y., and on Isle la Motte, Vt. 
The sequence was early separated into three divisions by Brainerd and Seely 
(1896) who designated them A, B, and C. Later, Cushing (1905) proposed to 
substitute the name Day Point for division A, Crown Point for division B, and 
Valcour for Division C. Raymond and others have expressed dissatisfaction 
with these names because the terms applied do not accord with the sections at 
the various places. For example, the section at Day Point belongs to the Crown 
Point formation. This is really not an issue because the Cushing names were 
made as substitutes for the Brainerd and Seely divisions and the reference sec- 
tions must be those given by Brainerd and Seely for their divisions rather than 
the locations from which Cushing took his names. 
Raymond (1905) made a detailed study of the fauna of the Chazy rocks on 
the west side of Lake Champlain and further divided the beds into faunal zones. 
Day Point formation.—This formation consists of gray sandstone inter- 
bedded with layers of slate or occasional limestone layers near the base. These 
beds are succeeded by nodular limestone that alternates with tough slate. The 
next division is composed of limestone often packed with Orthambonites ? 
exfoliata (Raymond). The uppermost limestone is in beds 8 to 20 inches thick 
and has many beds of echinoderm fragments. The whole sequence is 338 feet 
thick. 
Brachiopods recorded from the Day Point formation are: 
Camerella ? costata Billings 
C. longirostris Billings = Onychoplecia longirostris (Billings) 
Lingulella brainerdi (Raymond) 
Orthis acutiplicata Raymond = Orthambonites acutiplicatus (Raymond) 
O. exfoliata Raymond = Orthambonites ? exfoliatus (Raymond) 
Palacoglossa belli (Billings) 
Rafinesquina incrassata = Dactylogonia incrassata (Hall) 
Schizambon ? duplicimuratus Hudson=S. ? duplicimuratwm Hudson 
Correlation of Day Point formation.—The Day Point for the most part con- 
stitutes Raymond’s Hebertella exfoliata zone or division 1. This zone contains 
brachiopods and other fossils that are confined to it. At present no satisfactory 
correlation of this formation can be stated. The fauna seems not to have any 
connections with that of the Table Head or its equivalents and it is not assign- 
able to the Whiterock stage. The listed species are mostly related to higher 
Crown Point forms. 
Crown Point formation.—This formation consists of 200 to 400 feet, mostly 
of dark fine-grained, heavy-bedded limestone with occasional beds of light-gray 
coarsely crystalline limestone. Brachiopods are common: 
Camarella longirostris Billings = Onychoplecia gracilis (Raymond) 
Camerella varians Billings 
Camarotoechia pristina Raymond = Rostricellula pristina (Raymond) 
Clitambonites multicostatus Hudson = Atelelasma ? multicostatum (Hudson) 
Hebertella bellarugosa (Conrad) = Glyptorthis sulcata Cooper 
H, vulgaris Raymond = Mimella vulgaris (Raymond) 
