HARRISON COUNTY. 125 



The eighth and lowest deposit is a stiff black micaceous sandy clay, con- 

 taining numerous deposits of iron pyrites. In the deep well at Marshall this 

 clay has a thickness of nine hundred and fifty-four feet, and rests upon a blue 

 limestone (probably one of the large bowlders of the Basal Clays). 



2. The structure of the dark brown or orange-red sand covered area lying 

 around the base of the ridge or plateau is shown by the following sections: 



About a mile east of Marshall, on the Scottsville road, a cutting shows the 

 following section: 



1. Brown sand and gravel . 3 feet. 



2. Thin parting of gravelly ferruginous sandstone 1 inch. 



3. Stratified red and white sand and clayey sand 20 feet. 



The elevation of this section is about three hundred and ninety feet. 

 At the second mile, on the same road southeast of Marshall, a section of 

 the hill shows: 



1. Brown sand containing a considerable quantity of gravel 2 feet. 



2. Thin parting of ferruginous matter 2 inches. 



3. Stratified blue clay 10 feet. 



4. Dark blue stratified sandy clay ... 20 feet. 



5. Covered by a deposit of gravelly sand similar to the material lying on the top 



but comparatively free from gravel 20 feet. 



The top of this hill is flat for nearly a quarter of a mile, and on the south- 

 east side of the dark blue stratified sandy clay (No. 4) is replaced by a greenish 

 brown unstratified sand, having numerous small rounded and oval whitish 

 gray spots scattered through it. This sand has a tendency to glaze upon ex- 

 posure. This deposit is underlaid by the thinly laminated, regularly stratified 

 red and white sands. The elevation of this hill is about three hundred and 

 ninety feet. 



Six miles southeast of Marshall, on the same road, a cutting shows the fol- 

 lowing section: 



1. Dark brown unstratified sand, with a small deposit of greenish blue sand at base, 4 feet. 



2. Ferruginous parting, laminated . 1 foot. 



3. Greenish hued sand, weathering to a gray, stratified in thin laminae and having 



a slight dip to southeast 1 foot. 



4. Dark blue stratified clayey sand, weathering to a lighter color; thickness un- 



known 2 feet. + 



The elevation of this section is about three hundred and fifty feet. 

 Ten miles east of Marshall, on the Marshall and Shreveport road, a section 

 taken from an opening gives the following: 



1. Cinnamon brown sand 8 feet. 



2. Thin bed of lignitic matter 10 inches. 



3. Dark blue sandy clay, breaking into irregular fragments 2 feet. 



4. Light blue sand 6 feet. 



