30 Bulletin 9 ZZ2, 



8. Concretions with large O. var. sylvcsrupis 3 feet 



Water level 



Fossiliferous sands below No. 8 have furnished, during ex- 

 treme low water, a fine fauna, specimens from which were 

 figured in the writer's recent article in the Philadelphia Acad- 

 emy's Proceedings. No. 8 is a concretionary laj'er in part, and 

 in part simply an indurated band averaging two or three feet in 

 thickness with very uneven and undulating superior and inferior 

 surfaces. In these indurated layers are found large and well de- 

 fined Ostrea var. syhcBi^iipis. No. 7 contains a very rich fauna. No. 

 6 is but a sandy, grayish fossiliferous phase of No. 5 and contains 

 Clavilithes. No. 4 is not so fossiliferous as No. 7, but contains 

 many well preserved specimens of Volutilithes petrosiis, and Levi- 

 buccinum striatum. 



The more common species from this now famous exposure 

 have already been listed b}^ Heilprin and Aldrich. 



At Coffeeville a lower Claiborne deposit occurs, but several miles 

 below at Hatchetigbee bluff an uppermost Lignitic outcrop is 

 found. For perhaps 20 feet above water line finely laminated 

 dark clays predominate. Towards the lower end of the exposure 

 or cliff there is an upstream dip which brings to day two or three 

 layers of Venericardia planicosta often wnth valves united, almost 

 as perfect as the shells strewn along the shores of modern seas. 

 In with these Venericardia one observes Psetidolivtz and an occas- 

 ional Cornulina. From 10 to 20 feet above water level one finds 

 concretions, and, adhering to their lower surface are not a few 

 well preserved shells. Ledges of light colored material (buhr- 

 stone ?) occur here and there from 20 feet upwards, but brownish 

 clays predominate. High up in the latter one finds the most 

 and best fossils. This bluff has furnished Aldrich and the writer 

 several new species, some of which have been named after the 

 bluff — hatchetigbeensis . 



About three miles north of Pine Hill there is a railroad cut 

 which exposes at its northern terminus — about yi mile south of 

 Turkey creek — about five feet of light clay with a few rather 

 obscure fossils in its uppermost layers. By passing southward it 

 will be seen that a ferruginous greensand containg a fauna of 

 Naheola affinities overlies the clay. Astarte var. mediavia is 

 quite common here. Other clays appear, some bearing quartz 

 pebbles and some laid down more or less unconformably upon 



