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: Cross-bedded subunit lying on the bottom 2 layers of
Unit 4. Context image 0892 scale is approximate at 2 mm/pxl. Cross-bedded,
fine-grained rock with vesicles ranging in size and depth. Sparsely
distributed vesicles 10s of mm in diameter. Cross-bedding is confined to lower
layers. Embedded clasts within a fine-grained, primarily gray matrix. Grain
size is fairly homogenous at approximately .18-3 mm. Grains are sub-angular.

Texture
  Grain morphology and appearance: Rough, sub-angular tephra grains in a
clast-supported matrix. The grains themselves support vesicles within the
unit.
  Grain size and sorting: Poorly-sorted grains averaging about 0.18-3.0 mm, in
a clast-supported matrix.
  Grain fabric:  Polymodal.

Sediment structure:  Cross-bedded lamination.

Color: Light and dark grey, black, white and a few red grains.