G. D. Harris — Tertiary Geology of Maryland. 27 



place they are again barren and abrupt, though generally of a 

 very moderate elevation. The beds here exposed are as fol- 

 lows: 



No. 1. Pleistocene yellowish sand 30 feet. 



2. Zone e ; fossiliferous grayish and yellowish 



sand 5 " 



3. Bluish sandy clay 15 " 



A large collection of the fossils of Zone e was here made by 

 . Mr. Burns. It includes : 



Pelecypocla. — Pecten madisonius, Perna maxillata, Mytilus, 

 large cast perhaps M. incurva, Area elevata, Astarte obruta, var., 

 Crassatella turgidula, Lucina anodonta, Lucina contracta, Mysia 

 acclinis, Diplodonta sp., Cardium laqueatum, Isocardia rustica 

 Con. (partirn) non Sow., Venus raercenaria, var. mortoni, Cytherea 

 marylandica, Dosinia acetabula, " Petricola " centenaria, Tellina 

 biplicata, Corbula idonea, Panopsea porrecta, Panopaea americana. 



Gastropoda. — Ecphora quadricostata, Turritella plebeia, Natica 

 heros? Crucibulum sp. 



Section 11. — Below Flag pond, high bluffs again set in, and 

 present the following section : 



No. 1. Light sands and clays 25 feet. 



2. Band of Perna, Pecten, etc 2 " 



3. Bluish sandy clay 25 " 



4. Zone f ; overlaid by a one foot band of very 



hard ferruginous fragmentary rock 5 " 



5. Grayish sandy clay . 20 " 



6. Zone e.. * 5 " 



Between this and the next section, Zones e and f are often 

 wholly made up of huge, unshapely, hard rocks as described by 

 Conrad on page 183 of his article already referred to. 



Section 12. — This is the last exposure on the Bay shore 

 before reaching Cove point. Zonef is here found at tide level, 

 and is overlaid by about 15 feet of Pleistocene sand. 



Section 13. — It is impossible at present to state the exact 

 stratigraphic relations of the various fossiliferous zones occur- 

 ring south of Cove point with those to the north. Yet the 

 discrepancy here involved is in all probability a matter of not 

 over ten or twenty feet. Above Zonef'm. Section 11 there 

 are bluish clays whose equivalents farther south towards Sec- 

 tion 12 become blackish and contain a few organic remains. 

 Among these were noted Solen ensiformis a Mactroid shell 

 like a small Schizoderma delumbis, and Nassa jperalta. Section 

 13 is as follows : 



