68 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Surface and 25 feet, a yellowish white, friable oolite destitute of de- 

 terminable organic fragments. There is a mere trace of the angular 

 quartz sand at the surface, but apparently none from 25 feet. 



50 to 175 feet, a white, yellowish white, or very light gray, more or 

 less compact limestone with oolitic lumps in it. Recognizable remains 

 are mostly lamellibranchs, but the 50 foot sample is also foraminiferal. 

 Quartz sand is lacking in the 50 foot sample, but is present in varying 

 small amounts in the others. 



200 feet. — A fine white sand-rock partly compacted and almost 

 destitute of determinable fragments. Contains a small amount of the 

 quartz sand. 



225 to 275 feet. — A porous, white, soft, somewhat oolitic and sandy 

 rock containing some bits of lamellibranchs, but almost nothing else 

 recognizable. The quartz sand contains the relatively large rounded 

 grains already mentioned. There is a comparatively large amount of it 

 (the quartz sand) in the samples from 250 and 275 feet. 



300 to 375 feet. — AVhite, more or less solid sand-rock containing a 

 few ovules and a little oolite and some masses of dense limestone. Very 

 few determinable organic remains are present; among these, indications 

 of echini are relatively numerous at 325 feet, and of lamellibranchs at 

 375 feet. A comparatively huge amount of the angular quartz sand 

 was observed at 300 and 325 feet, and a small amount at the other two 

 depths. 



400 to 675 feet. — A decidedly gray sand-rock, presenting a marked 

 contrast to that above, soft and friable, but containing hard, dense, 

 light gray limestone at 500 feet, and rather hard, porous, almost white 

 rock, with granular calcite at 525 feet. Color seems darkest in the 

 samples from 400 to 475 feet. The quartz sand, which is present in 

 varying amounts, shows in some of the samples a relatively large number 

 of the coarse rounded grains. There is a great dearth of recognizable 

 fragments throughout this lot, and at 550 feet there seem to be none. 

 Of the few organic remains that can be determined lamellibranchs 

 appear to be the most numerous. A single minute brachiopod was 

 found at 425 feet, concerning which Prof. W. H. Dall writes me : 

 " It is either the .cistella stage of a large species, or a small species of 

 Cistetta. I am inclined to believe it the young of a larger species." 



700 to 1,075 feet. — A sand-rock varying in color from a yellowish 

 white in the upper portions to a very light yellowish brown in the 

 lower. The texture of the rock varies Bomewhat, also, being more of 

 shell-rock at 725 feet, and a rather hard, porous rock from 750 feet to 



