vaughan.] SECTIONS IN VICINITY OF SAN CARLOS. 81 
was not determined which of the horizons it represents, i. e., whether 
the one just below the coal or the one at the base of the section of the 
mountain. 
Fossils from favM north of shaft of San Carlos Coal Company {field No. 300) . 
Ostrea elegantula Newberry. 
Exogyra costata Say var. 
Inoceramus proxiinus Tuomey. • 
Cyprimeria sp. 
Cardium alabamense Gabb. 
Rostellites sp. 
Gyrodes sp. 
Gyrodes crenata Conrad? 
Schloenbachia delawarensis (Morton) . 
Placenticeras guadalupse (Roemer) . 
SANDS AND CLAYS. 
From observations in the entries at the shaft of the San Carlos Coal 
Company and in mine No. 4, it was ascertained that the clays and 
sandstones, which are yellowish on the surface, are of bluish color 
before exposure to the influence of weathering. 
SAN CARLOS AND ARROYO ABOVE. 
Near the store at San Carlos (field No. 290) were collected Placenti- 
ccrns (juadaliqxe (Roemer) and Schoenbachia delawarensu (Morton). 
Along- the San Carlos arroyo, above San Carlos, in the sandstone 
and clays above the coal, a few fragmentary vertebrate remains were 
collected, which have been examined by Mr. F. A. Lucas. He states 
that they include a fresh-water turtle and several dinosaurian bones of 
Cretaceous type. 
Section of Gettysburg Peak, 1 mile north, of San Carlos. 
(PI. IX; PI. XI, fig. 2c.) 
Feet. 
3. Quartz-pantellerite 180 
2. Ledges of variegated rock resembling sandstone, but probably composed 
largely of pyroclastic rhyolite 300 
1. Conglomerate bed. 
Resume of San Carlos section. 
Quartz-pantellerite. 
Vieja series: 
•"). Ledges of variegated rock, probably largely pyroclastic. 
4. Conglomerate bed. 
San Carlos formation: 
3. Sandstone and clays above coal, containing ('return his vertebrates. 
2. Coal horizon. 
1. Sandstone and clays below the coal, containing three or four horizons of 
invertebrate fossils. 
For the sandstones and clays containing the coal, below the Vieja 
series to the base of the San Carlos section, the name San Carlos for- 
mation is proposed. 
Bull. 164 6 
