Bulletin . owed that the fossil was found only in wells in the eastern partof the field and that the marker thus obtained indicated the presenceof two mounds there. Fragments of fossil-bearing rock are sometimes ejected from awell by the explosion of a heavy shot of nitroglycerin. L. A. Mylius,of the Illinois State Geological Survey, in a letter to the writer, saysthat a shot of 360 quarts of nitroglycerin at a well in Illinois blewout pieces of Trenton limestone that contained some characteristicOrdovician fossils. In California fossils are often found in the oil sand produced withthe oil: sh
Bulletin . owed that the fossil was found only in wells in the eastern partof the field and that the marker thus obtained indicated the presenceof two mounds there. Fragments of fossil-bearing rock are sometimes ejected from awell by the explosion of a heavy shot of nitroglycerin. L. A. Mylius,of the Illinois State Geological Survey, in a letter to the writer, saysthat a shot of 360 quarts of nitroglycerin at a well in Illinois blewout pieces of Trenton limestone that contained some characteristicOrdovician fossils. In California fossils are often found in the oil sand produced withthe oil: sharks teeth are found in oil sand of the Coalinga 3 cites examples of the occurrence of fossil material as shownin the paleontological collection of the fuel-oil department of theSouthern Pacific Midway-Sunset field. itchley, R. Geology of Illinois: Illinois Geol. Survey Bull. 22, 1915, p. 28. Harris, G. I>., Oil and wis in Louisiana: U. S. Geol. Survey Bull. 429, 1910, pp. if MINES. ?i :. -1200 II II c -1300 STANDARD On. COSEC1-A. 1400Bl. 1 V Bl. 1 ,,2 SEC11-A3. Bl 1700 Bl. c WELL-LOG CROSS SECTION, COALINGA OIL FIELD. CALIFORNIA, SHOWING THE USE OF RED ROCK MARKER OIL-FIELD ROCKS AND MINERALS. 23 P© 4-3 © © Ph o fis ^ ^ Kl © ^ W ffi oA o A © p be ©,P 73 p 03 ft rH o a ©© © io «+h co_r o +3 P o -1-3 03 73P o3 P O o3 73Po3 O O PQ W P P P £ £ £ o o ^o WWW 9 *0Q o 53 r rH O ?H Ph Ph Ph « •si od > tf CO CO CO <M<M CO CN! <M co CO co rfi CO (M CO CO CO co co co CO CO CO r-i i—I CO CO CO CO <N rH CO CO i-f 00 CO rH CO CO CO H lO © IOCO CO ?* lO H <o m n CO CO ^2 CD TjH Oi rH Tt< i—I CI 03 I oO oQ © <P © o3 Ph © rPP o CQ O Qo •rH© a w
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