. Geology and underground water resources of northern Louisiana . time, and the Belle Isle, one of a series of closelyrelated domes in southern Louisiana, shows movements in Quat-ernary time. In point of origin it is thought that these domeswere perhaps produced by the upward pressure of intrusions ofigneous rocks of limited area (see p. 18), and so may be termedbysmalithic domes or bysmalithic quaquaversals.^ 9 Geol. Survey Louisiana, Rept. for 1899, 1900, pp. 228-229; Geol. SurveyLouisiana, Rept. of 1902, pp, 99-100. s^Iddings, Jour. Geol., vol. 6, 1898 93 Since the above was wri
. Geology and underground water resources of northern Louisiana . time, and the Belle Isle, one of a series of closelyrelated domes in southern Louisiana, shows movements in Quat-ernary time. In point of origin it is thought that these domeswere perhaps produced by the upward pressure of intrusions ofigneous rocks of limited area (see p. 18), and so may be termedbysmalithic domes or bysmalithic quaquaversals.^ 9 Geol. Survey Louisiana, Rept. for 1899, 1900, pp. 228-229; Geol. SurveyLouisiana, Rept. of 1902, pp, 99-100. s^Iddings, Jour. Geol., vol. 6, 1898 93 Since the above was written I have found that Lee Hager (Eng. andMin. Jour., vol. 78, 1904, pp. 137-139, 180-183) has suggested a hypothesiswhich explains the origin of these and very similar domes in southernLouisiana and southeastern Texas by the upthrust of an igneous plug. His 314 TO ^ o n o _ o 5? o o o O 53 ^ UJ 2 -o ?« O > a. T) o 5 (D t/3 CL n a :? ■-t T. n > (T a o 21 ^ m •o Si ?« p < &- !0 3 o JO C n P o f 1 r TO > n. veatch] Underground Water of Northern La. 67 angelina caldwell flexure The low Angelina-Caldwell monoclinal flexure is known toextend from Angelina County, Tex., through Louisiana north ofNatchitoches, Winnfield, and Columbia to Mississippi River northof Vicksburg (Pis, xxxvii; xxxviii, sees. A, B, C, D, F). Itbegan to develop in Tertiary time, perhaps as early as the Oligo-cene, and is still a line of weakness. Recent movement alongits west end has resulted in the formation of a series of shoalson Sabine River and in the swamping of a part of the AngelinaRiver Valley in Angelina and Nacogdoches counties, Tex. Ithas almost entirely destroyed the southern element of the dipof the beds between its northern edge and a point about 60miles south of the Paleozoic border. Along the line of theflexure the dip of the Claiborne beds ranges from 46 feet atVicksburg to 150 feet on Sabine River. Still farther south thedip becomes less, though this change of the dip has as
Size: 1265px × 1976px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1900, bookpublishernp, bookyear1906
