PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

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


High-level Description: Palagonitized sequence of coarse- to fine-grained
layers in the northeast wall of Fort Rock Tuff Ring. Coarse-grained layers are
rich in basalt clasts (image 0993, 0994), with a high pore volume (image 0996)
- clasts as large as 4-6 mm, with pore space almost as large in between
grains. Fine-grained layers also contain basalt clasts but are more strongly
welded, with no macroscale pore space. Though the entire unit is
palagonitized, the heaviest palagonitization has occurred around the rims of
basalt lithics (e.g., image 0995). Orange-gold organics are evident in
microscale images.

Texture
  Grain morphology and appearance: Rough, sub-angular, grain-supported tephra
with larger, sub-angular lithics intermixed.
  Grain size and sorting:  Smaller tephra grains (0.34-1.2 mm diameter)
support lithics up to 1 cm in diameter. No sorting evident other than the
existence of alternating coarse- and fine-grained layers.
  Grain fabric:  Random orientation; unimodal.

Sediment structure:  None

Color:  Dark red, dark grey, black and white grains.