32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Kay (1947, p. 601) suggested substitution of the name Burchards for the 
“Crown Point” formation “east of the Champlain thrust” because it is “struc- 
turally separated from the Crown Point limestone of the type locality and other 
outcrops in New York and is succeeded by the Beldens formation rather than 
by the Valcour limestone.” 
Correlation of formations on the east side of the Champlain Valley.—In a 
recent table of correlations Kay (1948, p. 1402) indicates equivalence of the 
Carman quartzite with the sandstone at the base of the Day Point formation in 
New York. The Youngman formation then becomes the equivalent of the Crown 
Point and Valcour limestones of New York. The Beldens and Burchards are 
not equivalent to any known formation under this arrangement. Inasmuch as 
these correlations are based on the lithology of two sandstones and not on fos- 
sils, they cannot be regarded as reliable. Based on what fossil evidence is avail- 
able another arrangement is possible which is more in harmony with the known 
fossils. 
Inasmuch as the Burchards was originally called Crown Point and does con- 
tain Maclurites according to Cady (1945, pp. 548-549) it is reasonable to cor- 
relate the Burchards with the Crown Point limestone. This places the Beldens 
as a possible equivalent of a sandstone at the top of the Valcour formation al- 
though no other evidence than position is now known. The Youngman forma- 
tion with Christiania, by this arrangement would be thrown above the Chazy. 
This is in complete harmony with a similar situation in the Southern Appa- 
lachians where the Christiania beds of the Arline formation, probable equiva- 
lent of the Youngman, occur above Lenoir limestone with fossils that indicate 
correlation with the Crown Point-Valcour sequence. 
LOWER MOHAWK AND UPPER HUDSON VALLEYS 
Rocks deposited in the times embraced within this monograph are not well 
developed in this part of New York. The Lowville appears as remnants, about 
27 feet thick at Inghams Mills and 6 feet at Amsterdam, according to Kay (1937, 
p. 254). It is not known at Glens Falls in the upper Hudson Valley but is 
present in the Champlain Valley as noted above. The Chaumont formation was 
not identified by Kay in the Lower Mohawk Valley but does appear in the 
Champlain Valley. 
Amsterdam formation (Mohawk limestone of Conrad).—This formation 
is 11 feet thick in its type region but increases to 23 feet at Glens Falls. In the 
Saratoga Springs region Cushing and Ruedemann (1914, pp. 45-47) indicate 
an underground thickness of 40 to 60 feet. In the Saratoga region the limestone 
is somewhat thin bedded, crystalline, and fossiliferous. Kay (1937, p. 259) re- 
ports it as gray-black and heavy ledged in many sections in the Mohawk Valley. 
Few brachiopods have been listed from the formation: 
Dalmanella rogata (Sardeson) = Paucicrura rogata (Sardeson) 
Dinorthis pectinella (Emmons) 
Rhynchotrema sp. 
Strophomena trentonensis Winchell and Schuchert 
Zygospira sp. 
