129 Midway Stage 15 



Its beds show a decided dip in some places while in others they 

 appear horizontal. It is mainly composed of sandy material, 

 specked with fragments of lignite and containing numerous cal- 

 careous boulders especially toward its northern end. Here, too, 

 fossils were found from the water's edge to a height of about 11 

 feet. They are Ostrea crc7i2climargmata , Leda milainensis, Ceri- 

 thium penrosei, Pleurotoina ostrarupis, PI. anacona^ Fus2is ostra- 

 7^upis, Pseudoliva ostrartipis, Pseudoliva ostrarupis var. pauper. 



Falls co2inty. — Farther east, in Falls county, the Midway lime- 

 stone crops out along Salt Branch of Little Brazos river, on the 

 Dennis Herald survey. About % mile above the confluence of 

 the two streams, specimens of Venericardia planicosta, V. alticos- 

 iata, Enclimatoceras ulrirhi have been collected, and ^ mile still 

 farther up the Branch, Mesalia puniila occurs. 



Limestone coiMty. — This county furnishes many Midway ex- 

 posures and from them the members of the Texas Survey col- 

 lected various characteristic fossils. A locality known as Horn 

 Hill has furnished Veyiericardia planicosta, Ostrea crenuliniargin- 

 ata, Modiola saffordi, Turritella Inmierosa var. etcrynome or belli- 

 fera. 



In the vicinity of Tehuacana the limestone beds of the Mid- 

 way aggregate at least forty feet. They are overlaid by yel- 

 lowish and bluish, slightly argillaceous sandy layers which so 

 far as observed are un fossil if erous. West of the College, say ^ 

 mile, yellowish, calcareous sands occur forty-five feet or more 

 below the base of the limestone and contain among many indefi- 

 nite fossil remains fairly well preserved imprints of Turritella 

 morto7ii var. The same fauna is found in dense black clay, i >^ 

 miles north of the College for a distance of 70 feet below the 

 limestone. Other fragmentary specimens of Pleiwotonia., Nauii- 

 lusf and Aporrhais were seen here by the writer. Large calca- 

 reous boulders are of frequent occurrence in this horizon. 



So far as known there are no specimens of Ctic,ullcea in the im- 

 mediate vicinity of Tehuacana, though several specimens of 

 Ostrea cremdimargiyiata and Turritella humei^osa var. have been 

 collected. A large Enclimatoceras ulrichi in the College Museum 

 is labelled Nautilus danicus. 



The dip of this limestone formation varies considerably. In 

 some instances it rises to a pitch of 45 degrees and is generally 

 in a south-southeast direction. 



Kaufmavi county. — Going along the railroad from Wills Point 

 westward for about two miles one finds some good exposures of 

 laminated bluish and yellowish clays, calcareous nodules and 

 boulders. Lignitic and micaceous specks are not uncommon. 

 No fossils were here observed. Five miles west of Wills Point 



