294 



BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Preliminary description of the limestone samples and list of species of Foraminifera from 



the Bermuda well. 



No. of specimen 



and depth 

 below surface. 



Description. 



Species of Foraminifera. 



1 (0-6 feet) 



2 (61-110 feet) 



3 (110-216 feet) 



4 (216-241 feet) 



5 (241-286 feet) 



6 (286-331 feet) 



7 (331-341 feet) 



8 (341-383 feet) 



Light cream-colored limestone; mixture of cal- 

 cite and aragonite; most of the constituent 

 particles angular; largely or mostly broken 

 remains of organisms; occasional small round 

 grains 0.10 mm. or less in diameter, may be 

 aggregates of chemically precipitated calcium 

 carbonate. Largely or mostly an organic 

 limestone. 



Light cream-colored limestone; mixture of cal- 

 cite and aragonite; constituent particles most- 

 ly angular, Foraminifera and broken tests of 

 other organisms present; a few rounded grains 

 0.04 mm. or less in diameter, may be aggre- 

 gates of chemically precipitated material. 

 Largely or mostly an orgamc limestone. 



Light cream-colored limestone; mixture of cal- 

 cite and aragonite, apparently but httle ara- 

 gonite; largely a recrystallized limestone, 

 without conspicuous grains; some small pock- 

 ets contain pulverulent calcium carbonate; 

 some pieces granular. A few grains 0.05 to 

 0.8 mm. in diameter resemble small oolite 

 grains. The rock is mostly a foraminiferal 

 limestone, the FOTamimfera embedded in a 

 cryptocrystalUne matrix. 



Whitish limestone, very slight yellowish tinge, 

 some blackish particles; mixture of aragonite 

 and ealcite ; specimen consists mostly of broken 

 rock fragments; an occasional small pebble, 

 one 2.5 mm. as maximum diameter; constit- 

 uent material largely orgamc, Foraminifera, 

 fragments of mqllusks, shells, etc. Most small 

 particles angular; a few less than 0.12 

 mm. appear oolitic. One 0.09 by 0.17 mm. 

 in size had form of an oolitic ellipsoid . Mostly 

 an organic limestone. 



Whitish, faintly yellowish, pulverulent lime- 

 stone; mixture ofcalcite and aragonite. Com- 

 paratively few tests of orgamsms, some Fora- 

 minifera, many small rounded grains and 

 cryptocrystalltne material . Some of the roimd 

 grains appear oolitic; one of these is 0.11 by 

 0.15 mm. in size. It appears that a consider- 

 able proportion of this bed is a chemical pre- 

 cipitate. 



White, pulverulent limestone; mixture of eal- 

 cite and aragonite. No orgamc tests were ob- 

 served. Round grains up to 0.1 or 0.2 mm. 

 appear to be oolite; small round grains 0.04 

 mm. in diameter. Much cryptocrystalline 

 material. This bed appears to be largely a 

 chemical precipitate. 



White, friable limestone; mixture of ealcite and 

 aragonite. -Round grains which range in di- 

 ameter from 0.22 to 0.45 mm., may be oolitic. 

 Small grains, 0.09 mm. in diameter seem defi- 

 nitely oolitic. Besides the rounded, there are 

 broken angular grains and much cryptocrys- 

 talUne material. Few or no orgamc tests. 

 This appears to be largely a chemical precip- 

 itate. 



Light-colored, earthy, yellowish-gray, impure 

 limestone; some iron pyrites; mostly ealcite, 

 if aragonite is present the proportion is small. 

 Many Foraminifera, Nummulites, fragments of 

 coral, Bryozoa, etc.; many rounded grains 

 which may be detrital; no defimtely oolitic 

 grains were observed. A thin section shows 

 manyForamimfera embedded in a cryptocrys- 

 talUne matrix. This bed is an impure, forami- 

 mferal, shoal water limestone. It may con- 

 tain some chemically precipitated material. 



Textularia agglutinans d'Orbigny. 

 Polystomella striatopunctata Fichtel 



& Moll. 

 Polystomella species. 

 Amphistegina lessonii d'Orbigny. 

 Quinqueloculina reticulata d'Orbigny. 

 Q. oblonga Montagu. 

 Q. auberiana d'Orbigny. 

 Peneroplis pertusus Forsk&l. 

 Orbiculina adunca Fichtel & Moll. 



Textularia agglutinans d'Orbigny. 

 Polystomella striatopunctata Fichtel 



& Moll. 

 Polystomella species. 

 Amphistegina lessonii d'Orbigny. 

 Quinqueloculina reticulata d'Orbigny 

 Q. auberiana d'Orbigny. 

 Orbiculina adunca Fichtel & Moll. 



Clavulina angularis d'Orbigny. 

 Planorbulina larvata Parker & Jones. 

 Truncatulina species. 

 Polystomella striatopunctata Fichtel 



& Moll. 

 Amphistegina lessonii d'Orbigny. 

 Triloculina cf. T. circularis Borne- 



mann. 

 Orbiculina adunca Fichtel & Moll. 



Truncatulina species. 

 Pulvinulina canariensis d'Orbigny. 

 Polystomella striatopunctata Fichtel 



& Moll. 

 Polystomella species. 

 Amphistegina lessonii d'Orbigny. 

 Triloculina linneana d'Orbigny. 

 Orbiculina adunca Fichtel & Moll. 



species. 

 Truncatulina species. 

 Biscorbis vilardeboana d'Orbigny. 

 Amphistegina species. 

 Quinqueloculina reticulata d'Orbigny. 

 Biloculina species. 



None reported. 



Amphistegina species. 



Nummulites species. 



