File:Geology and agriculture (1892) (14745298646).jpg

Identifier: geologyagricultu05loui (find matches)
Title: Geology and agriculture
Year: 1892 (1890s)
Authors: Louisiana Geological Survey Louisiana Agricultural Experiment Station
Subjects: Geology
Publisher: Baton Rouge
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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tiary beds that he gave anew name to the group of sands and clays containing these con-cretions, calling them the Mansfield group. (See further underHistoric review.) The nature of the material that underlies the soils in this gen-eral region is well shown by the following section made from an outcrop in the gorge just west of the town. 5. Soil and red sand 5 ft. 4. Sand with iron streaks 10 ft. 3. Sand with a few light bluish clay streaks 5 ft. 2. Very light, or yellowish calcareous concretions 2 ft. I. Sandy, laminated, sands, with iron streaks above ; light sands, medially ; bluish laminated clays below 30 ft. As might be anticipated by the character of the rocks exposedin this section, the hill land about Mansfield is decidedly sandy.But there are broad bottom lands adjacent to stream courses, ofa more clayey and loamy character, and very productive. To thesouthwest and west, calcareous black land prairies are reported. At Logansport on the Sabine extensive deposits of lignite are
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II) General Geology : Lower Claiborne Eocene 73 described. Hilgard has noted similar beds in the Dolet hill.In fact, outcrops of this substance are of frequent occurrence inthis part of the State, and we are prepared to reaffirm Hilgardsstatement that lignitic strata crop out on both sides of thedividing ridge from Pleasant hill to Mansfield, towards Shreve-port. Various estimates are given as to the thickness and characterof these lignite beds. The whole subject must be taken upsystematically and monographed in some future annual report. Grand Cane.—Going north from Mansfield, numerous arena-ceous deposits are seen along the roadside, some showing flowand plunge structure. Post-oak flats with mounds are hereextensive. Red iron-stone concretions are here and there abun-dant. Yellowish concretionary limestone was noticed often nearGrand Cane. Stonewall.—Calcareous limestone boulders and lignite arenoticed about Stonewall. The soil and topographic features aresimilar to those around

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