40 



PROCEEDINGS OF THE ACADEMY OF 



[1887. 



General Section of the Cretaceous Strata of the Eastern, half of 



Texas. 



s 



W 



CO 



W 

 33 

 U 



< 



o 

 u 



7. 

 Navarro Beds. 



Eaglb Ford 

 Shales. 



Timber Creek 

 Beds. 



7. Strata in Navarro County, given this name by B. F. 

 Shumard and correlated with the Ripley Group in 1861; but 

 not placed in his general section of 1860 ; correlated with 

 Ripley Group at Terrell by R. H Loughridge ; 10th Census 

 Report, Vol. V. Included by Roemer, together with -i and 5 

 of this section, in his "Kreidebildungen am Fusse des Hoch- 

 landes." Outcrops along a narrow area upon the western 

 border of the Gulf States Tertiary. 



6. Outcrops to the west of No. 7. occupying the so-called 

 Black Prairie region. Of great thickness and uniformity of 

 character Recognized by Owen as extending into Arkansas, 

 and as equivalent with the rotten limestone of Mississippi, 

 named "Austin Limestone" by B. F. Shumard in 1860, and 

 placed in his section between Nos. 2 and 3 of this section, but 

 its true relation not then recognized. Included by Roemer 

 with No. 7. Sherman, Dallas, Waco, Austin and New Braun- 

 fels are approximately upon the western border of the out- 

 crop. 



5. Yellow arenaceous, and blue argillaceous shales, narrow 

 exposure west, and along the northern half of No 6. Is the 

 lower part of Shumard's Austin limestone, and also the 

 "Arenaceous Group" and "Fish Bed" of his Lower Cre- 

 taceous. 



4, Coarse ferruginous sands and clays ; fossiliferous. Has 

 been alluded to by various writers as "Tertiary," "Miocene," 

 "Quaternary," etc. Its outcrop is coextensive with the region 

 know as the Lower Cross Timbers. It apparently rests un- 

 conformably upon No. 3. 



3. 

 Washita 

 Division. 



2. 



Fredericksburg 



Division. 



Dinosaur Sands. 



3. Strata of this division at Fort Washita, I. T., partially 

 described in 18.54. and called "Senonien" by G. G. Shumard, 

 wrongly placed by B. F. Shumard. in his section, immediately 

 beneath No. 6 of this section. More comprehensively de- 

 scribed by Jules Marcou in 185.5, and referred to the Neoconian. 

 Is not distinctly .separable from No. 2, either by the character 

 of the strata or fossil contents. Outcrop occupies a narrow 

 belt extending southwaid from old Fort Washita via Denison. 

 Denton, Fort Worth, Salado, Austin, and westward of San 

 Antonio ; was included together with No 2 by Roemer in his 

 "Kreidebildungen des Hochlandes." 



2. In 1848 this division was included by Roemer in his 

 "Kreidebildungen des Hochlandes," as seen in buttes north 

 of Fredericksburg. It is also the "Comanche Peak Group," 

 the "Caprina Limestone" and "Caprotina Limestone" of B. 

 F. Shumard in 1860. These authors placed all except the last 

 named strata at the top of the whole Texas Cretaceous series. 

 Outcrops along the borders of the paleozoic areas in Central 

 Texas. 



1. Coarse silicious sand,, popularly called "pack-sand." 

 Occurs between the base of the fossiliferous Cretaceous and 

 the carboniferous series. Contains vertebrate remains. 



