84 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



1,900 feet. — Color light yellowish brown, with many white particles, like 

 the preceding, but the amount of residue on sifting is even less than with that. 

 A mere trace of the quartz sand is present. It is angular and limpid as usual. 

 The sand may have been compacted to some extent, and there were some 

 masses or layers of dense material in it, as is shown by some angular frag- 

 ments. Some few ovides. Organic remains consist mostly of foraminifera. 

 There are besides a very few bits of madrepores, some spines of echini, and a 

 few bryozoa. Remains of lamellibranchs are few and of gastropods still fewer. 

 Some rings look like parts of calcareous algae, while others are portions of 

 burrows and worm (?) tubes. 



1,925 feet. — Color yellowish brown, white spots. Trace of the cpiartz sand, 

 but it seems to be rather more than in the last. The sample is a very fine 

 sand, very little (about 5 % ?) failed to pass the sieve. Some ovules present, 

 This sand also appears to have been compacted to some extent, or to have had 

 compact lumps, and there are some angular fragments of dense limestone in the 

 material. Determinable organic remains are few. There are mostly forami- 

 nifera of the usual genera. With these are some bits of madrepores (?), spines 

 of echini, and bryozoa. Lamellibranch remains are rare, and those of gastro- 

 pods were not observed. Some nullipores. 



1,950 feet. — Color light yellowish brown. Quartz sand present in a very, 

 very few particles of the finest grain (angular). Not more than two per cent 

 of the sample failed to pass through the sieve. There were some lumps to 

 indicate that the sand had been compacted to some extent. Some ovules. 

 There were also a few angular bits of dense limestone containing organic re- 

 mains. Very, very little of the sample is determinable. There are a few large 

 foraminifera and some small ones. The large forms are Textularia. Some 

 spines of echini were noted, and some pieces that were probably bryozoa. 

 There were a very few remains of lamellibranchs, but none of gastropods were 

 recognized. 



1,975 feet. — Color light yellowish brown, with many white spots. Quartz 

 sand, a mere trace. The sample is a very fine calcareous sand, like the last, 

 with perhaps more compacted sand-rock in it. As before, there are a few 

 angular bits or chips of dense limestone. In regard to organic remains it is 

 like the last. 



2,000 feet. — The color has changed to a light brownish gray. Quartz Band, 

 a slight trace, an occasional particle of which is rounded and is too large to 

 go through the sieve. Less than half the sample went through the sieve. 

 The rock seems to have been a rather solid, very fossiliferous limestone. 

 Foraminifera are very abundant, and of more than the usual genera, low coni- 

 cal and high conical Textularias predominating. Hits of madrepore corals 

 present in small numbers. Spines, plates, and larger fragments of sea-urchin 

 tests are not uncommon. Several fragments of branching bryozoa were ob- 

 served, and a few pieces of lamellibranch shells and casts, as well as a very few 

 casts of minute gastropods. 



