70 GEOLOGY AND MINERAL RESOURCES OF MISSISSIPPI. 
A sample ol the yellow loam was collected from Grenada, and the following analysis of i 
has been made: 
Analysis of yellow loam from Grenada, Grenada County. 
[By W. F. Hand, State chemist.] 
Silica (Si0 2 ) 73. H 
Alumina (A1 2 3 ) 10. 44 
Ferric oxide ( Fe 2 < h) 5.1 
Lime (CaO) 1. 15 
Magnesia (MgO) 98 
Sulphur trioxide (S0 3 ) 18 
Moisture '2. 311 
Loss on ignition 2. 82j 
%.6i 
Stonington common brick clay. — The yellow loam occupies the surface in the vicinity of 
Stonington, Jefferson County. It is used here for making common wet-mud brick. When! 
mixed with the underlying white Grand Gulf clay it makes a substantial fire brick. The 
following is an analysis of the Stonington yellow loam: 
Analysis of Stonington brick clay, Jefferson County. 
[By W. F. Hand, State chemist.] 
Silica (Si0 2 ) 7^.80' 
Alumina ( A1 2 3 ) 1 1. 64 
Ferric oxide (Fe 2 3 ) />. 52J 
Lime (CaO) 44, 
Magnesia (MgO) 1.1 
Sulphur trioxide (S0 3 ) Trace! 
Moisture 2. 14 
Loss on ignition 4. 12 
!)7 69 
QUATERNARY CLAYS OF THE GULF COAST. 
South of the area of the Lafayette formation in southern Mississippi is a much later 
deposit of bluish-gray to red clay, in places containing calcareous nodules. This later] 
formation overlaps the Lafayette and forms the surface over a strip of country extending 
back 15 to 50 miles from the coast. On the geologic map (PI. I, p. 6) the clay has been 
mapped for the present as Port Hudson, the same as the deposit forming the surface of the 
Yazoo delta. In places this clay is being used for making brick. 
Biloxi clay. — At Biloxi. on the coast, George Orr has a small plant where he uses the 
Quaternary clay fo/ making pottery. Various pieces of fancy-shaped ware are made,! 
some of which show originality of design. The clay usually cracks on being exposed to a 
high degree of heat. It comes from a pit on Bayou Tchula Cabawfa, 4 miles northwest of 
Biloxi. The following analysis has been made of the Biloxi clay: 
Analysis of Biloxi clay, Harrison County. 
[By W. F. Hand, State chemist.] 
Silica (Si0 2 ) 73. 40 
Alumina ( A1 2 3 ) 17. 24 
Ferric oxide (Fe 2 3 ) 1. 30 
Lime (CaO) 32 
Magnesia (MgO) 41 
Sulphur trioxide (S0 3 ) Trace. 
Moisture 1 . 48 
Loss on ignition •. 5. 83; 
«»(). gd 
It may be of interest to note that the clay used in the Newcomb pottery, New Orleans, 
comes from Mississippi — the larger portion of it from Bayou Tchula Cabawfa, 5 miles from 
