PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 29 
Leptaena incrassata Hall = Dactylogonia incrassata (Hall) 
Leptellina primaria Cooper 
Lingulella columba Raymond 
Mimella nucleoidea Cooper 
M. ulrichi Cooper 
Multicostella platys (Billings) 
Orthidium ? lamellosum Raymond = Ptychoplewrella lamellosa (Raymond) 
Orthis costalis Hall = Hesperorthis ? costalis (Hall) 
O. ? porcia Billings = Ptychopleurella porcia (Billings) 
Petrocrania prona (Raymond) 
Rafinesquina champlainensis Raymond = Macrocoelia champlainensis (Raymond) 
R. distans Raymond = Glyptomena ? distans (Raymond) 
R. fasciata Hall = Dactylogonia incrassata (Hall) 
Rhynchonella ? acutirostris Hall = Sphenotreta acutirostris (Hall) 
Schizambon duplicimuratum Hudson 
Strophomena prisca Raymond = Glyptomena ? prisca (Raymond) 
Triplecia gracilis Raymond = Onychoplecia gracilis (Raymond) 
Valcourea strophomenoides (Raymond) 
Zygospira acutirostris (Hall) = Sphenotreta acutirostris (Hal!) 
Correlation of Crown Point formation—This formation is correlated with 
parts of the Mingan formation, the McLish formation, and the Lenoir formation. 
All the named formations also have elements of the Valcour fauna in them and 
all are correlated with the Crown Point—Valcour interval. 
Valcour formation.—This is division 3 of Raymond, or the Camarotoechia 
(=Rostricellula) plena zone. The formation contains massive dove-colored 
limestone at the base followed by impure limestone abounding in Rostricellula 
plena. The formation is capped by sandy magnesian limestone passing into sand- 
stone. It is 172 feet thick. The following brachiopods have been reported : 
Camarotoechia major Raymond = Rostricellula major (Raymond) 
C. plena (Hall) = R. plena (Hall) 
Dactylogonia sp. 
Glossina belli Billings = Palaeoglossa belli (Billings) 
Hebertella costalis (Hall) = Hesperorthis ? costalis (Hall) 
Mimella transversa Cooper 
M. valcourensis Cooper 
Orthis ignicula Raymond = Hesperorthis ignicula (Raymond) 
Rostricellula plena altilis (Hall) 
R. plena plicifera (Hall) 
Correlation of Valcour formation —Except for the continuation of this forma- 
tion in Canada, no other Chazy beds are quite like it. In the Appalachians the 
Lenoir formation contains elements of the Valcour as well as of the Crown Point. 
This is true also of the Mingan and McLish faunas. Furthermore, the Valcour 
contains species and genera that are related to Crown Point species or holdovers 
from that formation. It seems best, therefore, to include the Valcour formation 
with the Crown Point formation as a unit in correlation. 
Lowville formation.—This formation is represented by only 5 feet or a 
little more of heavy-bedded (6 to 12 inches) dove-colored limestone. The “birds- 
eyes” characteristic of the formation occur throughout. The only brachiopod 
reported is Zygospira recurvirostris (Hall). 
