160 D. DALE CONDIT 
scarcity or absence of garnet in the older sandstones generally 
prevails, I think, in all regions. I first recognized this in the 
Carbonic sandstones of Great Britain and soon afterward in those 
of Arabia Petreea and of northern Africa. It is also markedly 
absent or rare in the St. Peter, Cambrian, and older quartzites 
of this country.” 
In order to obtain data as to the occurrence of garnet in the 
older sandstones of eastern North America, a number of rock 
samples were examined. These were taken from collections of the 
Geological Department of Columbia University, and represent 
most of the important sandstones of the Paleozoic of the Appa- 
lachian region. There follows a summary of the results: 
Cambrian: (1) Etcheminian conglomerate, Hanford Brook, Nova Scotia. 
Zircon present. No garnet seen. (2) Feldspathic quartzite, contact with 
pre-Cambrian. Doe River, Tenn. Zircon, tourmaline, and microcline seen. 
No garnet. (3) Sandstone, Iron Mountain, Mo. Plagioclase and zircon 
found, also a few grains of garnet. 
Ordovician: St. Peter sandstone, Iowa. No garnet. 
Silurian: Sylvania sandstone, southern Michigan and northwestern Ohio. 
No garnet. 
Devonian: (1) Oriskany sandstone, Huntington, Pa. Zircon, tourmaline, 
and plagioclase (little decomposed). No garnet. (2) Oriskany sandstone, 
Vienna, Ontario County, N.Y. Zircon and calcite. No garnet. (3) Catskill 
sandstone, Monkey Hill, Delaware County, N.Y. Zircon and tourmaline. 
No garnet. (4) Catskill sandstone, Mill Creek, Pa. Tourmaline and zircon. 
No garnet. (5) Catskill sandstone, Catskill Mountains. A large number 
of thin sections were examined. (Quartzite pebbles were seen, showing that the 
formation was derived in part from the reworking of a previous sandstone. 
Considerable well-preserved feldspar, and much epidote and chlorite are 
present. No garnet was seen. 
Carboniferous: (1) Pocono sandstone, Dungannon, Pa. Zircon, tourma- 
line, and titanite present. One grain of garnet was seen. It had a pitted 
surface as though affected by solution. (2) Pocono, Pottsville, Pa. Zircon 
and tourmaline. No garnet. (3) Mauch Chunk sandstone, Cave Gorge, 
Dungannon, Pa. Zircon, plagioclase, tourmaline. No garnet. 
As was mentioned in a previous page, garnet was found in one 
sample from the Permian of West Virginia. The Triassic beds 
of New Jersey and Connecticut abound in garnet. The grains 
are always fresh appearing with little sign of solution or alteration. 
In attempting to account for the scarcity or absence of garnet 
