14 The American Geologist. January, 1892 
are not wanting, for Archwopterts hybernica is abundant above the 
fish bed. The Allegrippus conglomerate is no longer a constant 
member of the series, though occasionally it is recognizable 
without difficulty as a massive sandstone, sometimes containing 
flat pebbles. 
Thus far, the section observed beyond the James river in 
Virginia has been persistent, the distance along the line of out- 
crop being not far from 500 miles. In Columbia county, how- 
ever, the interval between the conglomerates is no longer richly 
fossiliferous, while fossils reach to but 516 feet above the Lacka- 
waxen, instead of to 1,000 feet as in Huntingdon county. The 
section is still sufficiently distinet at Hartville,* Luzerne county, 
Pa., about twenty miles further along the strike; but thence 
northeastward changes in structure become marked and are ac- 
companied by a still more rapid disappearance of animal remains, 
so that within a few miles such remains seem to be almost wholly 
wanting in beds above the place of the A//egrippus conglomerate. 
Prof. White's Pike county section was measured along the 
Delaware river about fifty miles northeastward from the Catawissa 
locality and practically on the same line of outcrop. It illus- 
trates the conditions in New York forthe Delaware river there cuts 
across the Catskill mountain region. The succession ist: 
CATSKILL. 
Honesdale sandstone 100’ 
‘Montrose sandstone 125' 
CHEMUNG. 
1. Montrose red shale 100° 
2. Greenish-gray sandstone 3 
3. Lackawaxen conglomerate 50’ 
4. Greenish sandstone and shale 300’ 
5. Red shale 50! 
6. Delaware flags 1,000 
7. New Milford shales and §. 8. iio 
8. Starucca beds 600' 
9. Sandstones and sandy shales 1,850’ 4,055’ 
The highest beds of the Catskill, the Cherry Ridge shales, were 
not measured, but they add barely 150 feet, so that, within little 
more than fifty miles, the Catskill has lost almost 3,000 feet, 
while the Chemung is but 400 feet thinner. But it should be 
noted that the upper portion of the Chemung has lost much, 
while the lower portion has increased greatly. The Allegrippus 
—*W ‘hite, Loc. cit. p. 196. 
+Geology of Pike and Monroe counties, I. C. White, Harrisburg, 1882, 
"3 
pp. 73 and 94, 
