. Oil investigations in 1917 and 1918 . ity between Salem and Warsaw. Salem limestone(above) dipping to the right; Warsaw (below) horizontal. The following section is typical of the Warsaw of ihis region: Measured section of the Warsaiv formation along a stream in SE. 14 sec. 18, T. 2 8., R. 3 W. ThicknessFeet inches 15. Shale, blue, calcareous 2 6 14. Clay shale, soft, blue, unfossiliferous 6 13. Limestone, geodiferous, with abundant fossils 1 6 12. Clay shale, blue, full of geodes 2 11. Clay shale, blue 2 10. Limestone, with abundant fossils 2 6 BROWN COUNTY 37 Measured section of the Warsaw
. Oil investigations in 1917 and 1918 . ity between Salem and Warsaw. Salem limestone(above) dipping to the right; Warsaw (below) horizontal. The following section is typical of the Warsaw of ihis region: Measured section of the Warsaiv formation along a stream in SE. 14 sec. 18, T. 2 8., R. 3 W. ThicknessFeet inches 15. Shale, blue, calcareous 2 6 14. Clay shale, soft, blue, unfossiliferous 6 13. Limestone, geodiferous, with abundant fossils 1 6 12. Clay shale, blue, full of geodes 2 11. Clay shale, blue 2 10. Limestone, with abundant fossils 2 6 BROWN COUNTY 37 Measured section of the Warsaw formation—Concluded ThicknessFeet inches9. Shales, sandy, with thin lenses of limestone, fossiliferous 4 8. Clay shales, soft, blue 6 7. Limestone, sandy, full of fossils . 8 6. Clay shales, soft, blue, with abundant bryozoans 2 5. Clay shales, soft, blue, free from fossils 12 4. Geode bed 6 3. Clay shales, soft, blue 4 6 2. Clay shales, blue, alternating with thin, sandy limestone beds 4 1. Clay shales, soft, blue, exposed 7 57 2. Fig. 12. Unconformity between Salem (above), dipping to the right, and War-saw (below) horizontal, SE. 14 sec. 19, T. 2 S., R. 3 W. KEOKUK FORMATION The Keokuk formation of this region consists of an upper bed ofshale which is crowded with geodes for the most part, and a lower mem-ber of gray, crystalline limestone with numerous lenses and thin layersof chert. The Warsaw shales lie above the geode beds in perfect con-formity with them, and no attempt was made to distinguish between thetwo in this work. The geode beds outcrop along McGees Creek in thesouthwestern corner of the county. The lower limestone member outcrops at only one or two localitiesnear the county line south of Benville, where a maximum thickness of24 feet was measured. Fossils collected from this limestone were identi- 38 OIL INVESTIGATIONS fied as of Keokuk age by Stuart Weller of the University of limestone is the oldest rock which outcrops in the county. Nothingis
Size: 2095px × 1192px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherurban, bookyear1919
