PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

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

Unit 4 (reference, Deschutes_Formation_strat.jpg). Massive lahar with some
discrete layering. Sequence from bottom to top displays poorly-sorted layers,
massive unit, oxidized layers, crossbeds and vesicular sequence.

High-level Description: Coarse/fine-grained, layered sequence lying on the
bottom layer of Unit 4. Sequences is definitively layered, as compared to the
sequence below. Grains up to 10 cm across occur within coarse-grained layers
(image 0871).

Texture
  Grain morphology and appearance: Rough, rubbly, sub-angular to sub-round
tephra grains layered in a coarse- (images 0868-0871) to fine-grained (images
0872-3) alternating sequence.
  Grain size and sorting: Poorly-sorted alternating coarse- to fine-grained
layers, with fine grains averaging 0.2 mm and coarse grains averaging 0.8 mm
in diameter. Larger lithics (up to 10 cm) occur in the coarse-grained layers.
  Grain fabric:  Polymodal.

Sediment structure:  Parallel lamination.

Color:  Black and buff grains, with some white and a few red grains mixed.