132 The American Geologist. August, looi 
A second point which was made in my paper pul)Hshcd in the 
Quarterly Journal of the London Geological Society (vol. Ivii, 1901, p. 
249) relates to the extensive deposit of heach gravel upon the face of 
the precipitous cliff of volcanic rock which rises immediately behind 
Trebizond on the Black sea. This deposit reaches to a hight of 750 
feet above the sea, and is of a character and extent such as utterly 
precludes its accumulation in any other way than by wave action at 
that level. The material is not local, it is much rounded, it is out of all 
possible relations to any local streams which might have deposited it, 
it is fresh in appearance, and is subsequent to all the principal rock 
erosion of the region. In presence of these facts, our failure to find 
seashells, or indeed the total absence of seashells, would not weigh 
strongly in the balance against the inference that they indicate a re- 
cent water level of the Black sea. 
Since returning home one of my pupils, who is skilled in such in- 
vestigations, informs me that he has found a similar deposit near 
Samsoun, which is also upon the Black sea about one hundred miles to 
the west. But I will not anticipate the full statement of the facts 
which I hope to make when the present pressure of my daily duties 
shall be removed. G. Frederick Wright. 
Oberlin, July 22, 1901. 
Billings and His Bibliography : Will you please add the following 
titles to the bibliography of Elkanah Billings, given in the May num- 
ber of the American Geologist? I am indebted to major A. W. 
Vogdes of Brooklyn, for four of these references. 
i860. 
Additional Note on the Potsdam Fossils Amer. Jour. Sci & Arts, 
Vol. 30, i860, 2d Ser., pp. 337-33S; New Haven, Conn. 
1862. 
On professor Hall's Claim of Priority in Determination of the Age 
of the Red Sandstone of J'ennont. Amer. Jour. Sci. & Arts, 2d 
Ser., Vol. 33, pp. 370-376, 1862; New Haven, Conn. 
1865. 
Notiee of Some New Genera and Species of Palaeozoic Fossils. Can. 
Nat. & Geol., Vol. 2, 2d Ser., pp. 425-432, Dec, i«t»5; Montreal, 
Canada. 
1869. 
Note on the Structure of the Blaistodea. Amer. Jour. Sci. & Arts, 
Vol. 47, p. 353, 1869; New Haven, Conn. 
1872. 
On Some N'etv Species of Paleozoic Fossils. Amer. Jour. Sci. & 
Arts, Vol. 3, 3d Ser., pp. 352-360; New Haven, Conn. 
Ottawa, Can. " n. m. ami. 
