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Report of Investigations — No. 11
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type of Ellenburger : 14 Warren Springs—Moore Hollow: 12, 14 shale: 20 Shell No. 18E Preston well: 16 siliceous oolite: 10 spicules: 10 silicified eoliths: 11 silt: 12 silty material: 20 Simpson formation : 8 Somervell County: 15 Spicewood Creek section: 14 sample descriptions : 30—35 spicular chert: 20 spicules, siliceous : 10 sponge spicules: 21 standard section of Ellenburger: 14 Staendebach member : 6, 7, 13, 14, 31-35, 36-39 subsurface sections, correlation of : 15-18 surface samples, preparation of: 9 surface sections : 9-10 Backbone Mountain: 9 Cherokee Creek: 9 Gorman Falls —Tanyard : 9 Johnson City: 9 Llano River: 9 sample descriptions : 28-41 Gorman Palls section : 23-30 Spicewood Creek section : 30-35
Tanyard section: 36—41 Threadgill Creek: 9 Warren Springs—Moore Hollow : 9 syngenetic cherts: 10, 11 residues : 10 Tanyard formation : 7. 8, 12-13, 17, 31-35, 36-41 —Gorman boundary: 15, 17 residues : 16 section: 14 sample description : 36-41 Taylor County: 16 texture: 18 Threadgill Creek section : 8, 12, 13 Threadgill member: 6, 7, 12, 13, 14, 16, 39-41 Todd field: 18 tripolite: 18 type logs: 14 section of Ellenburger: 14 Van Horn region : 7, 18 Warren Springs—Moore Hollow section: 9, 12, 14 West Spring Creek formation : 16 Wichita County: 16 Mountains: 7, 8, 15, 16 Wilberns age: 12 dolomites : 11, 13 formation: 16, 17, 41
