PORTAGE AND CHEMUNG FORMATIONS OF MARYLAND 333 



Productella speciosa Hall, abundant 

 Leiorhynchus glohuliforme (Vanuxem), common 

 Cyrtina hamiltonensis Hall, common 

 Lingula spatulata Vanuxem ? 

 Spirijer mesastrialis Hall, rare 



The above faunule suggests that found at 1,000 feet altitude at 

 Great Cacapon. About 1,500 feet above the base of the Jennings 

 occurs an iron-stained conglomeratic sandstone i foot thick, loaded 

 with Camarotoechia congregata (Conrad), and bearing also Camaro- 

 toechia eximia Hall ? and Spirijer mesacostalis Hall. The latter shows 

 a strongly developed median septum in the ventral valve. Red bands 

 appear just below this stratum, which seems to be identical with the 

 similarly situated conglomerate already mentioned in the preceding 

 section. Tropidoleptus carinatus Conrad was obtained in apparently 

 the same horizon south of the Potomac River. About 2,100 feet 

 above the base of the Jennings (at the turn of the road west of Tonolo- 

 way Creek) occur: 



Spirijer mesastrialis Hall 

 Chontes scitulus Hall 

 Ambocoelia umbonata (Conrad) 

 Orthoceras sp. 



Fifty feet above the latter Spirijer disjunctus was found. ^ 

 Harrisonville Road. — This section is exposed on the Harrisonville 

 Road two miles north of Hancock and one mile east of Dogtown, Pa. 

 The lower part of the Jennings contains the Naples fauna. Seven 

 hundred and twenty-five feet above the base of the Jennings the fol- 

 lowing species were obtained : 



Atrypa reticularis (L). 

 Pugnax pugnus (Martin). 

 Schizophoria striatula (Schloth). 

 Camarotoechia sp. 

 Aulopora ( ?) sp. 



It will be observed that the lower brachiopod fauna appears at about 

 the same altitude in the Great Cacapon section. 



Millstone. — This section is exposed on the Western Maryland 

 Railroad one-half mile east of Millstone, and five miles east of Han- 



I This section is complicated by minor folds. The measurements are taken from 

 the section at gerkley Spring which is on the strike of the section discussed and is 

 free from folds. 



