﻿538 



BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Oligocene — Continued. 

 Oulebra formation — 



18. J jifj;iiit ic hIuiIo hod at baso of limoalono 



17. Dark, woU laininatiHl, very friablo, carbonacooua 

 nhales and days with dark, granular, tufaccxjua 



material. Fo.ssila at haHO 



16. c. Light colored, sandy linicstono. Thickness 1^ 



6019/- 6. Dark, very friable shales and tuiTs. Fossils abun- 

 dant, Lcpidoci/dina rhapcri. Thickness 3 



a. Light colored sandy linicHtone to limy sandstone. 



ThicknoHH I J 



15. Dark, friable nhale, clay and tufaceous material with 

 some thin layers of limy sandstone in the upper 



part 



60l9<r-14. Thin-bedded, light-gray to crmnj-colorcni limy 

 sandslono with some j)arting8 of light-colored clay, 



Orbitolites, etc 



13. Fine-grained, very friable, dark-gray, tufaceous 



material, well si ratified 



6019rf-12. c. (irayish-green, limy, tiifaccoiiH sandstones 



/;. Dark, carbonaceovis clays and tuff 



6019c- a. Grayish, wcll-stratitied, and very friable tufa- 

 ceous sandstone 



(Total thickness, 7 feet.) 

 60196-lL Dark, well stratilicd, and very friable tufaceous 

 material; some fossils. Turritella^ Area, Car- 



diinn , etc. , OrJnfoliten 



6019(1-10. Grayish, rather nodular, impure limestone, contains 

 some g'reen pailiclcs; Lepidocydina canellei was 



collected in this bed 



9. Lignitic shale bed maximum. . 



8. Dark-gray carbonaceous clays, friable shales and 

 tuffs, some lines of limy nodules parallel to the 

 bedding. Some of these concretions are as much 

 as G inches thick and a foot long, their longer 

 axes parallel to the bcddiiig. One or two regu- 

 lar lines of these nodules near base 



7. Very friable lignitic shale bed maximunu . 



6. Dark-gray carbonaceous clays, friable shales and 

 tulfs. Lenses of limy nodules parallel to bed- 

 ding, same as (8) 



6020o f . Just b(-low the second line of nodules in these (G) 

 beds fossils were found as follows: Area, Ostrea, 

 , Pecten, Spondylus, etc. Among the fossil cor- 

 als are Orbicella, Sixlcmstrm, and Goniopora; 

 one Sidnvsirn head measured 20 inches high by 

 21 inches in horizontal diameter. 

 6020b b. A few feet below (r) found inimerous cerithiids, 



Nassa, and Corbula. 

 6020a a. In the lower lay(>rs of tliis member of the section 

 (No. G) wer(» found sonic ]H)orly preserved mol- 

 lusks, such as Area, Cdrdiniu, Tellina, Venus, 

 and fragments of crab c-laws in calcareous nod- 

 ules. 



Feet Uiiok. 



30 



10 



33 



