WILCOX CLAYS. 65 
Analysis of Oxford day, Lafayette count'/. 
[By W. F. Hand, State chemist.] 
Silica (SiOs) . 57. 79 
Alumina (AI2O3) 26.03 
Ferric oxide (Fe20 3 ) 2. 98 
Lime (CaO) 44 
Magnesia (MgO) 10 
Sulphur trioxide (SO3) 24 
Moisture 1 . 14 
Loss on ignition «t. 1 1 
97.83 
Russell clay. — A stratified plastic gray clay outcrops in a deep gully on Walsh Russell's 
land, in Lafayette County, and has been analyzed as follows: 
Analysis of Russell clay, Lafayette County. 
[By W. F. Hand, State chemist.] 
Silica (S1O2) 51. 88 
Alumina (AI2O3) 30. 64 
Ferric oxide (Fe 2 3 ) 3. 53 
Lime (CaO) 58 
Magnesia (MgO) 60 
Moisture 1.16 
Loss on ignition 10. 14 
98.53 
Grenada clay No. 1. — At the wagon bridge across Yalobusha River at Grenada the dark- 
blue lignitic clay of the upper Wilcox formation outcrops in the river bank, where there is 
an exposure of this clay 20 feet thick. It is overlain by more sandy clays, which alternate 
with strata of micaceous sand to the top of the high hill west of Grenada. There is more or 
less fine siliceous sand and mica in the dark clay at the bridge. When burned the clay 
becomes a pale rusty red, owing to the presence of iron oxide. The following is an analysis 
of this clay : 
Analysis of Grenada clay No. 1, Grenada County. 
[By W. F. Hand, State chemist.] 
Silica (Si0 2 ) • 61. 80 
Alumina (AI2O3) 16.50 
Ferric oxide (Fe 2 3 ) 3 - 88 
Lime (CaO) 1-00 
Magnesia (MgO) 23 
Sulphur trioxide (SO3) 10 
Moisture 5. 91 
Loss on ignition 8. 75 
98.26 
Grenada clay No. 2.— At the foot of the high range of hills 1 mile east of Grenada, on the 
public road, is a very siliceous clay belonging to the Wilcox formation. This has been 
analyzed as follows : 
Analysis of Grenada clay No. 2, Grenada County. 
[By W. FrHand, State chemist.] 
Silica (SiO j) 90 - 33 
Alumina (AI2O3) 2 - 85 
Ferric oxide (Fe 2 3 ) L 49 
IfLime (CaO) 71 
Magnesia (MgO) 14 
■Sulphur trioxide (SO3) - 19 
Moisture 58 
ross on ignition • _ d 
97.74 
