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Logging Clastics. Depth Scale Contacts Grain Size Rock Type Bioturbation Color Fossils and Sedimentary Structures Comments . Text: Manual, p. 21-27; Compton, Ch. 11; p. 376-378 . Logging Clastics. Goals. To accurately and graphically represent:

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slide1

Logging Clastics

  • Depth Scale
  • Contacts
  • Grain Size
  • Rock Type
  • Bioturbation
  • Color
  • Fossils and Sedimentary Structures
  • Comments

Text: Manual, p. 21-27; Compton, Ch. 11; p. 376-378

slide2

Logging Clastics

Goals

  • To accurately and graphically represent:
  • Thicknesses of rock types.
  • Detailed, sequential descriptions.
  • Exact stratigraphic position of rock types,
  • sedimentary structures, and fossils.
slide3

Logging Clastics

http://sealevel2.jpl.nasa.gov/

slide6

Logging Clastics

  • Depth Scale
  • Contacts
  • Grain Size
  • Rock Type
  • Bioturbation
  • Color
  • Fossils and Sedimentary Structures
  • Comments

Text: Compton, Ch. 11; p. 376-378

slide7

Depth Scale

  • Calculate total depth and appropriate scale / units

Deepest (bottom)  Shallowest (top)

slide8

Contacts

  • Mark major contacts
  • Determine nature of contacts (sharp, gradational, erosional)
slide9

Contacts

S Sharp G Gradational

SI Sharp irregular B Gradational-interbedded

SC Sharp conformable VS Visibly scoured

SD Sharp disconformable BU Burrowed

ST Stylolite

slide10

Grain Size

  • Determine grain size between major contacts.
  • Plot weathering profile of gravel:sand:mud.
slide11

Grain Size

Weathering Profile

slide12

Logging Clastics

  • Depth Scale
  • Contacts
  • Grain Size
  • Rock Type
  • Bioturbation
  • Color
  • Fossils and Sedimentary Structures
  • Comments

Text: Manual, p. 21-27; Compton, Ch. 11; p. 376-378

slide13

Rock Type

  • Determine rock type(s) and fill in patterns

(see Compton, p. 376-377)

slide14

Rock Type

(Manual, p. 92)

slide15

Bioturbation

  • Determine extent of bioturbation
slide16

Color

  • Indicate color with letter symbols.

L - Light G - Gray C - Cream

M - Medium B - Brown W - White

D - Dark R - Red Bk - Black

m - Mottled O - Orange Cl - Clear

Y - Yellow Gn - Green

Bl – Blue

Example: LBG = light brownish gray

slide17

Logging Clastics

  • Depth Scale
  • Contacts
  • Grain Size
  • Rock Type
  • Bioturbation
  • Color
  • Fossils and Sedimentary Structures
  • Comments

Text: Manual, p. 21-27; Compton, Ch. 11; p. 376-378

slide18

Fossils and Sedimentary Structures

  • Indicate fossils and sedimentary structures

(Manual p. 21a)

slide20

Fossils and

Sedimentary Structures

Carbonate Structures

(Manual, p. 94)

slide21

Comments

  • Include comments of features not depicted graphically
  • - soil horizons
  • - organics
  • - accessory minerals
  • - cements
  • - porosity