2(>N The A merica n Geologist. April, 1894 
ii. Aqueous deposits of superficial origin (sedimentan rocks, etc.): 
1. Mechanical deposits (fragmental nicks). 
(a) Normal fragmental rocks. 
(b) Placer deposits. 
2. Chemical deposits (chemically formed rocks, etc.). 
(a) < Nidation deposits. 
(l>) Reduction deposits. 
(c) Evaporal ion deposits. 
3. Organic deposits (organically formed rocks, etc.). 
(a) Hydrocarbons. 
(b) Siliceous rocks. 
(c i < Calcareous rocks. 
(d) Phosphatic rocks. 
4. Metamorphic deppsits. 
(a) Normal metamorphic rocks. 
(l>) Original disseminations in metamorphic rocks. 
."). Residual deposits. 
(a) Residuary metalliferous deposits. 
1 1)) Residuary earthy and siliceous deposits. 
GEOLOGY OF JEFFERSON COUNTY, TEXAS. 
W. Kennedy, Austin, Texas. 
Early last spring (1893) a company was formed at Beau- 
mont in Jefferson county, Texas, with the ostensible purpose 
of exploring for natural gas, oil and sulphur, supposed to 
exist in great quantities in that portion of the state. 
Jefferson county lies in the extreme southeastern corner of 
the state. The Neches river and Sabine lake form its eastern 
boundary, the gulf of Mexico lies to the south, Chambers 
county and Liberty county form the western line, and Pine 
Island bayou stretches across the northern end. In total, the 
county embraces an area of 1,032 square miles. The whole 
county is low and flat, a great portion of it lying scarcely 
above high water level. Beaumont, the county seat, has an 
altitude of only 26 feet above the waters of the gulf. The 
upper end of the county rises slightly higher than this, but 
not much, and all the streams of the district are directly af- 
fected by the rise and fall of the gulf tides. 
The lower half of the county, with the exception of a nar- 
row strip in the vicinity of Sabine pass, is marshy and suitable 
only for the growth of rice, of which great quantities are 
annually raised. This same region is also used as extensive 
