14 Bulletin 4 138 



' ' Cuadlisa niaa^odonta [perhaps saffordi'\ , Peduncuhis , Venericar- 

 dia [pi. 5, fig. 3], Cardhun [pi. 6, fig^ 3].'' "The shell}^. matter 

 of these species is completely crystallized." "The matrix was 

 evidently a calcareous light sand or sandstone." — Harris, Ann'l 

 Rep't Geol. Surv. Ark., vol. ii, 1892. 



Colorado 7'iver section. — " Near Webberville, Travis county, on 

 the Colorado river below Austin (Station 2438) Mr. Stanton 

 found a cla3^ey limestone more or less streaked with brown and 

 j^ellowish shades but usually of a light yellowish hue. Choco- 

 late colored, silicious pebbles, generally cuboidal in form, are 

 often found in the more clayey beds. The enclosed shells, 

 nearly always crystalline, are Cticullcea macrodontix [saffordif'\ , 

 Venericardia, Venericardia planicosta, Crassatella \C. gabbi~\, 

 Lit/wdojnus , Volutilithesf ^ coral, sharks' teeth." 



From a well at Elgin in the northern corner of Bastrop 

 county, Mr. Dumble obtained Vohitilithes limopsis and Pleurotoma 

 anacona. — Harris, MS. Rep't on Tex. Tert. 



Brazos river sectio7i. — On this river the contact of the Midway 

 with the underlying Cretaceous is well exhibited in a bluff 

 about where the southeast line of the Hogan Survey crosses the 

 river, or perhaps 1}^ miles above the Falls-Milam county line. 

 This bluff is about 200 yards long and where the best outcrop 

 occurs it shows at the base 14 feet of Cretaceous, containing 

 Baculities, et al., then i foot of material of doubtful age, and 

 above, an unweathered bed of Eocene 4 feet thick with Calyp- 

 trophorus velatus, Aporrhais sp., Turritella alabainiensis , Veneri- 

 cardia alticostata, Crassatella gabbi, Yoldia eborea. Above this 

 bed is one of yellow, weathered Eocene i foot thick; above are 

 gravels and sands 3 feet in thickness. 



About one-half mile below this bluff good exposures occur 

 exhibiting Ostrea ptilaskensis, Enclimatocej'as ulrichi, Calyptro- 

 phoriis velatus, Cucullcsa, Ttirritella alabainiensis , Yoldia eborea. 



A mile further down-stream or near the Falls-Milam count)^ 

 line there is a high bluff about ^ mile in length which in some 

 places contains numerous molluscan remains. In its upper por- 

 tion yellowish sands prevail, then calcareous sandy layers appear, 

 grayish in color, containing Venericardia alticostata and Cucullcsa 

 macrodonta. Below, the sands are bluish and clayey, and the 

 lower portion of the bluff is composed of bluish black clays 

 breaking with conchoidal fracture and containing Calyptrophorus 

 velatics, CucullcBa macrodonta., Crassatella gabbi (see pi. 5, figs. 

 ID and 11), Yoldia eborea, Turritella nerinexa. 



A few miles farther down-stream, at a locality heretofore spoken 

 of as "2 miles above the mouth of Pond creek" and near the 

 residence of Mr. Smiley, another bluff }{ mile in length appears. 



