PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

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


High-level Description: Bomb sag distorting layers within tuff pillar in the
center of the Fort Rock ring. Quartz or zeolites deposited in between and
through clasts, clast-supported layers with greater pore space surrounded by
more matrix-supported tuff.

Texture
  Grain morphology and appearance: Rough, sub-angular, grain-supported tephra
with larger, sub-angular lithics intermixed. Zeolites growing interstitially
in clast-supported pore space.
  Grain size and sorting:  Smaller tephra grains (0.07-1 mm diameter) support
occasional 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; polymodal.

Sediment structure:  Parallel lamination

Color:  Tan, dark grey, black and white grains with clear/white zeolites.