Sedimentary Rock Descriptions and Distractions Description vs Interpretation Rock Descriptions Unit Descriptions Distractions Text: Manual, p. 13-16, 77-90;

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Presentation transcript:

Sedimentary Rock Descriptions and Distractions Description vs Interpretation Rock Descriptions Unit Descriptions Distractions Text: Manual, p , 77-90; Compton, p

Rock Descriptions rock type stratigraphic name

Rock Descriptions stratigraphic name rock type color

(Luis Garcia)

Rock Descriptions stratigraphic name rock type color texture

Rock Descriptions Texture: 1. Grain Size 256-8boulder 64-6cobblegravel 4-2pebble 2-1granule_______ 10.0very coarse sand coarse sand medium sandsand fine sand very fine sand_______ coarse silt medium siltmud fine silt very fine silt   clay mm Phi (  ) Wentworth Size Class

angular grains well rounded grains Rock Descriptions Texture: 2. Grain Shape (Roundness)

Rock Descriptions Texture: 3. Sorting

(AGI, 1999) Rock Descriptions Texture: 4. Arrangement imbrication

energy/environment of deposition transport history Rock Descriptions Texture Interpretations

Rock Descriptions stratigraphic name rock type color texture grain composition

Rock Descriptions stratigraphic name rock type color texture grain composition porosity cements

grain porosity matrix cement (M. Campbell) Rock Descriptions

name rock type color texture grain composition porosity cements bedding

Rock Descriptions Bedding: Types Castile Formation, NM (Anderson et al., 1972) 10 cm laminations

Rock Descriptions Bedding: Types cross-bedding

Rock Descriptions Bedding: Types graded bedding (AGI, 1999)

Rock Descriptions Bedding: Thickness

Rock Descriptions Bedding: Contacts

Rock Descriptions stratigraphic name rock type color texture grain composition porosity cements bedding sedimentary structures

wave ripples Rock Descriptions Sedimentary Structures

Rock Descriptions burrows Sedimentary Structures

Rock Descriptions Sedimentary Structures mudcracks (AGI, 1999)

Rock Descriptions stratigraphic name rock type color texture grain composition porosity cements bedding sedimentary structures bioturbation

Rock Descriptions Bioturbation (E. McBride)

Rock Descriptions stratigraphic name rock type color texture grain composition porosity cements bedding sedimentary structures bioturbation fossils

Trace Fossils Rock Descriptions Fossils Body Fossils

Cretaceous fossils in central Texas Rock Descriptions Fossils

UT AUSTIN Interpretation

Rock Descriptions Additional Details for Sandstones: - FMCP:QFR - Clan Name

Rock Descriptions Sandstone Clan Names

Sedimentary Rock Descriptions and Distractions Description vs Interpretation Rock Descriptions Unit Descriptions Distractions Text: Manual, p , 77-90; Compton, p ,

Unit Descriptions stratigraphic name rock types brief rock descriptions - percentages - thicknesses - contacts - interbedding special features - soil and vegetation - topographic expression gradational sharp interbedding

Unit Descriptions bench slope cliff

Sedimentary Rock Descriptions and Distractions Description vs Interpretation Rock Descriptions Unit Descriptions Distractions Text: Manual, p , 77-90; Compton, p ,

Distractions Vegetation

(Luis Garcia) Distractions Algae

Distractions Lichen

Distractions Travertine

(E. McBride) Distractions Weathering

Distractions (E. McBride) Colluvium

Distractions Float (E. McBride)

Distractions Dynamite (E. McBride)

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