PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

OBJECT                = TEXT
  PUBLICATION_DATE    = 2009-11-15
  NOTE                = "Sample description"
END_OBJECT            = TEXT
END


High-level Description: Oxidized basalt outcrop from the summit of Lava Butte
showing weathering due to primary structure (compare to spheroidal
weathering). Layering within the sample is likely due to differential internal
cooling and volatile concentration (e.g., image 1227). Outcrop texture is
determined by vesicle pattern (e.g., image 1227), stretched in many cases
along the direction of flow (image 1229). Vesicles range from 0.2-1.5 mm
across. Comparatively smooth rock face with weathered features; rock's layers
have been weathered away successively.

Texture
  Grain morphology and appearance: Rough, sub-angular basalt grains in a
vesicular spatter-type lava outcrop.
  Grain size and sorting: Basaltic grains range from sub-resolution to 0.4 mm
in diameter and average .1 mm in diameter. No sorting evident.
  Grain fabric:  Random orientation; polymodal.

Sediment structure:  Layering due to differential internal cooling.

Color:  Black, grey, red and orange grains.