LOWEE CKETACEOUS. 599 



Hickory Creek section of the Travis Peak formation, beginning at the top of the divide between Hickory 

 and Cow creeks and continuing to the .Colorado River level at the mouth of Hickory Creek, 

 Burnet County." 



reet. 

 12. Bands of conglomerate and calcareous sandstone, alternating with beds of arenaceous lime- 

 stone, the arenaceous limestone predominating 40 



11. Marly magnesian limestone 40 



10. Calcareous sand at base, grading upward to a siliceous limestone at the top, barren of fossils. . 55 



9. Yellow calcareous sand, stratified 15 



8. Conglomerate similar in character to No. 2, with the exception that the pebbles are smaller 



and more worn, grading into sand below and into calcareous sand above 25 



7. Red sand, unconsolidated 3 



6. Friable yellow sand 5 



5. Cross-bedded shell breccia, containing many small rounded grains and pebbles of quartz 



flint and granite sand. Fossils: Trigonia and small bivalves, and Ammonites justing 7 



4. Ostrea beds, magnesian lime cement, fossils en masse 3 



3. Brecciated grit, composed of worn fragments of oyster shells and shells of other MoUusca, with 



sand and fine pebbles, stratified in false beds ' 5 



2. Bands of friable bluish shale and calcareous sand, stratified. Fragments of oyster shells are 



common in the calcareous sandstone 15 



1. Basal conglomerate of pebbles of limestone, quartz, chert, granite, and schist, well rounded 

 in a cement of ferruginous yellow and red gritty sand. Some of the pebbles at the base are 

 from 5 to 6 inches in diameter. They decrease in size, however, upward from the base, 

 until a false-bedded calcareous shell grit appears at the top 50 



Total thickness of Travis Peak beds 263 



Carboniferous: 



Laminated, flaggy Carboniferous sandstones and friable light-blue clay of Carboniferous 

 (Coal Measures) age from the Colorado River level upward to the base of the Trinity con- 

 glomerate, the laminated sandstone containing prints of ferns, nearly 100 



[Total thickness of section] 363 



Section at Post Mountain, 1 mile west of Burnet. '' 



Fredericksburg division: Feet. 



5. Barren Edwards limestone and Comanche Peak limestone 95 



4. Walnut clay 10 



105 



Trinity division: 



3. Impure arenaceous limestone and marl with aragonite crystals 25 



2. Limestone agglomerate of shells with asphaltum 25 



1. Reddish sandy clays and conglomerate 20 



70 

 Paleozoic. =^= 



175 

 Section of Trinity formation. 



From divide west of Cow Creek on road southwest to bench mark 842. 



Feet. 



Chalky white limestone, weathering porous or honeycombed; fossils 15 



Similar but not honeycombed; weathers knotty 20 



Covered slope 40 



Wagon road. 



Buff-weathering limestone; no fossils 12J 



1 Section by J. A. Taff (HUl, R. T., Geography and geology of the Black and Grand prairies, Texas: Twenty-first 

 Ann. Rept. U. S. Geol. Survey, pt. 7, 1901, p. 140). 

 6 Hill, R. T., op. cit., p. 136. 



