306 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 13, No. 14 
Saint Thomas 
The presence of sediments of Upper Cretaceous age in Saint Thomas 
was first recognized by Cleve in 1869, when he collected a moderate 
number of fossils and recognized the affinities of the fauna with that 
of Gosau, Austria. Some years ago Professor A. G. Hégbom of the 
University of Upsala lent me the Cleve collection and Doctor Stanton 
listed for me the genera of the fossils. They are as follows: 
Glycymeris Corbula 
' Limopsis Cerithium, two or more species 
Astarte, several species Nerinea, several species 
Opis Actaeonella 
Cyprina? Phylioceras?, immature, septa not well 
shown. 
_ It seems that I did not rediscover the precise spot at which Cleve 
obtained his specimens; however, I collected at Coki Point, one of the 
localities mentioned by Cleve, poorly preserved fossils that seem to 
represent the genera Astarte, Glauconia, Cerithiwm, and Actaeonella. 
The fauna is clearly the one discovered by Cleve. The fossils occur 
in very hard, blue, metamorphosed limestone. At a locality near 
Coki Point, limestone belonging to the same formation contains some 
volcanic material and is associated with, probably interbedded with, 
shaly rocks that have been metamorphosed into schists. 
The principal country rock of Saint Thomas comprises andesitic 
breccia and latite, which in places shows rude bedding. I did not 
actually observe the relations of these rocks to the Cretaceous lime- 
stone, but the older volcanic rocks have been considerably meta- 
morphosed. It is to rocks of this kind that the local name ‘‘blue- 
beach”’ is applied. Cleve says that he found north of Bucks Bay 
‘‘blue-beache, black and sometimes metamorphosed clay slate, and 
flagstone, alternating;’”’ and he says that near Coki Point the blue 
beach contains “‘caleareous nodules and marble of a white or gray 
color.”’ The older volcanic rocks, therefore, seem to be of Upper 
Cretaceous age. 
Saint John 
Except large rounded, apparently water-worn boulders about half 
a mile east of Government House, Little Cruz Bay, the only rocks I 
saw on Saint John are clearly of igneous origin. The rocks at Coral 
Bay are chlorite and sericite schists and are inferred to be of Creta- 
ceous or more ancient age, because of the metamorphism they have 
undergone. Cleve mentions greatly metamorphosed limestone at 
