24 



CAPE COD GEOLOGY 



3. Glauconite from Gay Head; analysis by Dana. Dana, J. D., and Brush, J. G., De- 

 scriptive mineralogy, 9th ed., New York, p. 462, 1889. 



4. Glauconite from Big Goose Canyon, 15 miles southeast of Sheridan, Wyo. Analysis 

 by George Steiger (sp. gr. 2. 73). Prom Analysis of rocks and minerals, U. S. Geol. Survey 

 Bull. 591, p. 340, 1915. 



5. Glauconite from an igneous rock at Mount Baldo; analysis by Delesse, 1848. Dana, 

 J. D., and Brush, J. G., Descriptive Mineralogy, 9th ed., New York, p. 462, 1889. 



6. Glauconite from Station 164B (410 fathoms), No. 85. Report of Challenger Expedi- 

 tion on deep-sea deposits, p. 387. 



For references to important papers on glauconite and additional analyses of materials 

 from foreign localities, see Clarke, F. W., The data of geochemistry, U. S. Geol. Survey Bull. 

 330, pp. 439-442, 1908; and Bull. No. 491, pp. 492-494, 1911. On the Cretaceous greensand of 

 New Jersey and its origin, see Clark, W. B., A preliminary report on the Cretaceous and 

 Tertiary formations of New Jersey, Ann. Rept. State Geologist for 1892, pp. 218-239, and 

 Plates 4-6, reproduced from Challenger Expedition report. Analyses of New Jersey green- 

 sands at p. 230. Clark (p. 220) cites Pourtales as reporting greensand at depths from 50 to 100 

 fathoms on the present sea floor off the coasts of Georgia and South Carolina. 



See also Ashley, G. H., Notes on the greensand deposits of the eastern United States, 

 U. S. Geol. Survey Bull. 660, pp. 27-49, 1918; Goldman, M. I., The petrography and genesis 

 of the sediments of the Upper Cretaceous of Maryland, Maryland Geol. Survey, Upper Cre- 

 taceous, pp. 111-182, 1916|_ Collet, L. W., Les depots marins, pp. 132-194, 303-306, Paris, 

 1908; and Thoulet, M. J., Etude bathylithologique des cotes du golfe de Lion, Inst, oceano- 

 graphique Annales, 4, No. 6, pp. 62 et seq., Paris, 1912. 



FOSSILS FROM THE GREENSAND AT GAY HEAD AND NASHAQUITSA 

 Of the fossils collected from the greensand beds in the Gay Head cliffs in 

 1889 by Dr. A. F. Foerste and J. B. Woodworth, Dall identified the following 

 species : 



Yoldia limatula Say 



Nucula shaleri Dall 



Area (like A. ponderosa Say) 



Angulus sp. 



Macoma lyelli Dall 



Lucina sp. 



Venus mortoni Conrad 



Macrocallistaf sp. 



Venus {Gemma) purpurea Lea 

 Mya, probably M. arenaria L. 

 Panope goldfussi Wagner 

 Cardium, virginianum? Conrad 

 Chrysodomus (cf. C. liratus Martyn) 

 Chrysodomus, probably C. stonei Pilsbry 

 Pecten (cf. P. irradians Lam.) 

 Solen solen (fragment) 



Cardium virginianum Conrad, listed with the species found in the greensand 

 bed, is found on the cliff in the talus just below the outcrop of the osseous con- 

 glomerate. A specimen was found there by me in 1889, and Professor Charles 

 Killam of Harvard University picked up a specimen of the same species at about 

 the same place in my presence in 1917. The casts are composed of a white kaolin- 

 ite containing grains of quartz, and the bed is apparently identical with that 

 beneath the Aquinnah 1 or the osseous conglomerate of Hitchcock, which is 



1 Aquinnah, the Indian name for Gay Head, is used in this report for the osseous conglomerate of 

 Hitchcock. 



