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SOIL SUIIVEY ()IF Lt'BBt)('( (()ITNTY, TEXAS. 17
The lighter-colored soils of the upland are classed in the Brackett
series. This series is characterized by light-brown or grayish surface
soils and grayish or white, friable, pervious subsoils. The soil layer
is generally thin and highly calcareous. In this county the Brackett
gravelly loam, fine sandy loam, and loam are mapped.
The surface soils of the Randall series are dark drab to black,
and the subsoils somewhat lighter, usually drab or dark gray. The
soils of this series consist of sediments washed from surrounding soils
derived from unconsolidated Tertiary formations and deposited in
shallow depressions occupied by temporary lakes or ponds. They
are entirely without drainage and are subject to periodic submergence.
The clay is the only type of this series developed in Lubbock
County.
The alluvial soils are included in the Frio series. The surface
soils of this series vary from very light brown or grayish to very
dark brown or nearly black and overlie brownish subsoils. The subsoil
is calcareous, usually heavier in texture than the surface soil.
Only the loam type of this series is mapped in Lubbock County.
The following table gives the actual and relative extent of the
different soil types:
Areas of different soils.
Soil.As. Sl Acres.oil. Acres.
cent. cent.
Amarillo fine sandy loam .......... 158,592 391 Richfield fine sandy loam ....... 9,66.1 1.7
Heavy phase..................... 58,496 } Frioloam ....................... 9,664 1.7
Amarillo clay loam................ 161,344 29.1 Brackett gravelly loam.......... 6,656 1.2
Richfield clay loam............... 97,664 17.6 Steep broken land................ 5,696 1.0
Richfield loam................ 19,456 3.5 Amarillo loamy fine sand......... 4,544 .8
Brackett loam ..................... 4,864 Brackett fine sandy loam........ 2,432 .4
Colluvial phase ... ......... 6,208
Randall clay.................... 10,240 1.9 Total......... ........... 555, 520 ......
AMARILLO LOAMY FINE SAND.
The surface soil of the Amarillo loamy fine sand consists of a reddish-brown
loamy fine sand, 8 to 15 inches deep. The subsoil is a
red or reddish-brown, moderately compact, heavy fine sandy loam
to fine sandy clay loam, changing at 2 to 3 feet into loose fine
sandy loam or loamy fine sand. In some places the type as mapped
does not differ essentially from the typical Amarillo fine sandy loam
except in the looser structure of the surface soil, but generally
there is a higher percentage of sand and the marl substratum lies
at depths greater than 4 feet. Some deep soil occurs in small areas
where the material from 18 to 30 inches is a light loamy fine sand,
having a light-brown color at the surface, but gradually changing