1895. ] NATURAL SCIENCES OF PHILADELPHIA. 145 



2. Thinly laminated dark blue clays with broken 



bivalve shells in the upper division and 

 occasional nodules of limestone 30 " 



3. Yellow Ponderosa marls forming the highest 



Cretaceous bed at this place — 



The contact between these beds and the underlying Cretaceous as 

 seen in the Brazos river section presents a section of: 



1. River alluvium 4 feet. 



2. Gravel 1 foot. 



3. Blue clay and sand breaking into nodules and 



conchoidal pieces, weathering into a grayish 

 yellow and containing Cucullcea macrodonta 

 Whitf. , Yoldla eborea Conrad, Veneri- 

 cardia alticosta Con., var. , Calyptrophorus 

 retains Con., Cerithium ap.,iGrassatella sp., 

 Apporhxm gracilis Aid., and Ostrea 

 puktsJcensia Harris 74 5 feet. 



4. Transitional blue clay 1 foot. 



5. Massive blue clay with Baculites and other 



Cretaceous fossils 14 feet. 



About 90 feet above the base as seen at Elmo in Kaufman county 

 there are two beds of limestone, the upper one measuring eight feet 

 and the lower ten feet in thickness. These are separated by two feet 

 of brown sand. These limestones are highly fossiliferous containing 

 such fossils as Ououlkea macrodonta Whitf., Vevericardia alticosta 

 Con., var., Venericardin planicosta Lam., Grassatella (Midway sp.,) 

 Cytherea sp., Pyrula (Fnsoficnht) var. Pseadolira unicarinata Aid., 

 Pleurotoma (JPleurotomella) anacona Harris, n. sp. , Ostrea palash- 

 ensis Harris and Turritella sp. 



These two beds are seen about a mile north of Elmo in the follow- 

 ing section : 



1. White fossiliferous limestone 8 feet. 



2. Brown sand 2 " 



3. Limestone same as No. 1 10" 



4. Dark bluish gray sand 30 " 



At Rocky Cedar only the upper bed is seen and is here 20 feet 

 thick. 



" Harris MSS. 



