Page 247 - 1915, Springs of CA.

CARBONATED SPRINGS. 229

them had an appreciable flow. Each of these yielded perhaps 1
gallon a minute. One of them issued horizontally, with considerable
force, among lime-cemented bowlders at the creek side. The small
flow is worthy of remark in connection with the size of the deposit.
The rocks of this region are slates and sandstones, with some
quartzitic material, that are very probably of the same series that
has been mapped by Diller,1 3 or 4 miles westward, and by Turner,2
2 or 3 miles southward, as the Calaveras formation, of Carboniferous

Although no lava was observed near the springs, the southeastern
border of the lava area that surrounds Lassen Peak is only about 10
miles to the west. The massive and hoodoo-like character of the
underlying portion of .the deposit makes it seem not improbable that
the springs were thermal and accomplished most of their work of
deposition during or shortly following the eruptions from Lassen Peak,
and that they represent one phase of the results of volcanic activity
when that mountain was in the making.
ARLINGTON SPRINGS (PLTTMAS 12).
There are two carbonated springs near the Arlington Bridge, at
the southeastern edge of Indian Valley, 3J miles in a direct line
northwest of the carbonated springs on Indian Creek. One of the
Arlington Springs, as they are locally known (though the name Bach
Springs has also been applied to them), rises in a barrel at the road-
side; the other issues from a short piece of 1-inch pipe, on the gentle
hill slope 25 yards to the southeast. Both yield cool, pleasantly car-
bonated water. The following partial analysis shows the water to be
chiefly of secondary alkaline character:

Analysis of water from main spring, Arlington Springs, Plumas County, Cal.
[Analyst, G. E. Colby (1906). Authority, owner of springs. Constituents are in parts per million.]

Properties of reaction:
10
Secondary salinity .............. ................ .............................. 0
0
3
87
( f)
By Reacting
Constituents.
weight. values.
| 235 11.77
Iron (Fe). ........................................................................... Small. Small.
Sulphate (SO4). ..................................................................... 33 .69
Chloride(Cl). ....................................................................... 23 .66
Carbonate (CO3)...... . .............................................................. 365 12.18
100
Silica (SiO2). .. . ..................................................................... Small. Small.
799
Carbon dioxide (CO2) ...............................................................
1 Diller, J. S., U. S. Geol. Survey Geol. Atlas, Lassen Peak folio (No. 15), 1895.
2 Turner, H. W., U. S. Geol. Survey Geol. Atlas, Downieville folio (No. 37), 1897.