26 G. D. Harris — Tertiary Geology of Maryland. 



tide level than in Section 7, while at an elevation of 40 feet, a 

 new fauna makes its appearance {Zone e). Here the species of 

 Barker's land on the Choptank, and Jones's wharf on the Pat- 

 uxent river predominate to the exclusion of those mentioned 

 on page 25 from Zone b, of Section 6. Some of the fossils 

 here recognized are : Pecten madisonius, Perna maxillata, 

 Mytiloconcha, Astarte obruta var., Crassatella turgidida, 

 Cardium laqueatu?n, Venus mercetiaria, Corbula idonea, 

 Ecphora quadricostata, Turritella plebeia, etc. For several 

 feet above, in the face of the cliff, no well preserved fossils are 

 seen ; but in an old roadway, perhaps 200 yards back from the 

 shore, at an elevation of from 60 to 77 feet Mr. Burns discovered 

 a recurrence of this fauna in a friable, yellow sand matrix. Its 

 position is indicated in Section 8 by the letter f. The more 

 abundant and conspicuous fossils from this locality are : 



Area elevata, Carditamera protracta, Astarte obruta, Crassa- 

 tella marylandica, Crassatella turgidula, Lucina contracta, Luciua 

 anodonta, Mysia acclinis, Cardium laqueatum, Isocardia n. sp., 

 Venus mercenaria var. mortoui, Cytherea marylandica, Dosinia 

 acetabula, Corbula idonea, Panopsea americana, Natica duplicata. 



South of Section 8, Zonef shows plainly in the face of the 

 cliffs, but is too high to be reached. Large masses, however, 

 are often dislodged by atmospheric agencies and, in falling, 

 crumble to pieces, and afford ample opportunity for examining 

 their fossil contents. In this way Pecten madisonius* Perna 

 maxillata, Cytherea sayana f Tellina biplicata, and " Petri- 

 oola v centenaria have been added to the faunal list of Zonef. 



Section 9. — The following section was taken about two- 

 fifths of a mile north of Governor's Run : 



No. 1. Bluish and yellowish sandy clay 25 feet. 



2. Blue clay (base of Pleistocene?) 5 " 



3. Yellow sand 0-3 " 



4. Zonef; yellow fossiliferous sand 15 " 



5. Resembling No. 4, but with few small fossils 4 " 



6. Marly bluish sand --- --- 20 " 



7. Zone e ; Yellowish and grayish fossiliferous 



sand . 4 " 



8. Yellow sand with blue clay bands 15 " 



9. Blue clay 8 " 



10. Zone d ; Isocardia bed ; 3 " 



11. Bluish clayey sand. 3 " 



Section 10. — The escarpments south of Governor's Run are 

 for some distance obscured by the growth of trees, underbrush, 

 and grasses; but at Section 10, about 2J miles south of this 



