PHOTOGRAPHS DONATED TO THE SOCIETY. 425 
1541 (77). A dry swamp hole northwest of Skinquarter, Virginia, showing mud- 
cracks and grass border. September 13, 1897, after a protracted 
drought. : 
1542 (109). Fragment of prismatic coke from Saunder’s slope, at Gayton, between. 
600 and 700 foot level, at contact with decomposed vertical trap dike 
: This is the popping coke. 
1643 (113). An outcrop of the columnar coke, north of Saunder’s slope, in valley 
of small stream. Columns dipping 36° plus toward north 70° west, 
magnetic. Slaty band at top. Strike of slaty band north 25° east, 
magnetic. 
1544 (131). View of south bank of James river from Mr Parson’s house, at Vinita, 
Virginia. James River flood-plain in foreground. Looking south. 
1545 (135). James river and Cornwallis hill. Looking north 70° west, magnetic, 
from edge of bluff at Goat hill. 
Six views presented by the U. S. Geological Survey (Whitman Cross) 
Size, 74 by 94 inches. Figures in parentheses are original numbers 
1546 (262). La Plata mountains, Colorado. Looking up Boren gulch from the 
southeast. Babcock and Spiller peaks in the center. The peaks 
mainly made up of a diorite stock cutting Mesozoic strata. An 
irregular diorite-porphyry body causes jagged cliffs on the left side 
, of Boren gulch. 
1547 (268). Cliffs at the head of Bedrock gulch, La Plata mountains, Colorado. 
Formation of cliffs is La Plata Jurassic sandstone, much indurated: 
1548 (270). A ravine at the head of Bedrock gulch, La Plata mountains, Colorado. 
The rock here‘is much shattered and highly altered diorite-porphyry. 
1549 (272). Mount Lewis, La Plata mountains, Colorado. View from the south- 
east. The peak consists of Triassic sandstones, etcetera, with nu- 
merous sheets and dikes of diorite-porphyry, and a small stock of 
diorite, producing much metamorphism of the strata. 
1550 (274). Silver peak, La Plata mountains, Colorado. View from the northeast. 
The mountain is a huge irregular mass of diorite-porphyry and di- 
orite in Mesozoic beds. 
Seven views presented by the U. S. Geological Survey (J. S. Diller) 
. Size, 43 by 63 inches. Figures in parentheses are original numbers 
1551 (278). The Sharkstooth, La Plata mountains, Colorado. The upper expos- 
ures are of a diorite-porphyry sheet intruded into Cretaceous shales. 
The lower cliffs are of a sheet in the Jurassic shales. Illustrates 
formation of talus slopes. 
1092 (363). Sea cliff near Rose’s, 14 miles inland and about 100 feet above the , 
present beach at Five-mile point. Rose’s black sand mine is at the 
foot of this bluff. 
1553 (364). Rose’s black sand mine. The bedrock in the foreground of Eocene 
shales and highly tilted. Upon this rests the black sand, which is 
overlaid by a considerable thickness of sands and clays. 
lood (382). The cable and house of the light-house keeper at mouth of Coos bay. 
