72 TRANSACTIONS OF THE [JAN. 23 
strongly resembled the norites of the Cortland Series,* near 
Peekskill, and those of the exposures near Baltimore.+ Its 
great freshness gave the impression at the time that it was an 
abnormal Triassic diabase, and the discovery was held in 
abeyance until it would be possible to visit the region itself. 
Meantime Messrs. Campbell and Brown] announced the hyper- 
sthene-diabase of Virginia and recorded its discovery in western 
New Jersey and eastern Pennsylvania, by Mr. Darton, so that 
although it had been learned that Van Artsdalen’s quarry is in 
a little exposure of limestone, in the Archzean strip that crosses 
southeasten Bucks Country it was inferred that an erratic had 
[S555q 
lO S257} 
SGHISTS | LIMESTONE 
Determinations of numbered specimens of map. 1-5 Limestone and 
inclusions of silicates. 6. Decomposed gneiss. 7. Dark gneiss. 
8. Green schist. 9. Decomposed gneissic gabbro? 10. Quartzose 
gneiss. 12. Mica schist. 13. Mica schist. ee Quartzite. 15. Coarse 
gneiss. 16. Diabase boulder. 17. Coarse gneiss or granite. 18. 
Gneiss. 20. Conglomerate. 21. Schistose gneiss. 22. Gabbro. 23. 
Pegmatite. 26. Arkose. 27. Quartzite. 
*See J. D. Dana, Amer. Jour. Sci. Sept. 1880, p. 197. G. H. Williams, idem, 
Feb. 1887, p. 135, Mar. p. 191. 
1G. H. Williams, Bulletin 28, U. 8. Geol. Survey. 
+H. D. Campbell and W. G. Brown, Bull. Geol. Soe. of Amer. ii. 339, 1891. 
