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  2. Ripple marks - Wikipedia

    en.wikipedia.org/wiki/Ripple_marks

    Current ripple marks, unidirectional ripples, or asymmetrical ripple marks are asymmetrical in profile, with a gentle up-current slope and a steeper down-current slope. The down-current slope is the angle of repose, which depends on the shape of the sediment.

  3. Sedimentary structures - Wikipedia

    en.wikipedia.org/wiki/Sedimentary_structures

    This creates ripple marks with pointed crests and rounded troughs, which aren't inclined more to a certain direction. Three common sedimentary structures that are created by these processes are herringbone cross-stratification, flaser bedding, and interference ripples. Asymmetrical ripple marks These are created by a one way current, for ...

  4. Graded bedding - Wikipedia

    en.wikipedia.org/wiki/Graded_bedding

    Schematic illustrations of two styles of graded bedding: left: normal grading; right: inverse grading. Schematic illustrations of two styles of graded bedding: left: normal grading; right: coarse tail grading. In geology, a graded bed is a bed characterized by a systematic change in grain or clast size from bottom to top of the bed.

  5. Wave-formed ripple - Wikipedia

    en.wikipedia.org/wiki/Wave-formed_ripple

    Symmetrical ripple. Although symmetrical ripples are also called bi-directional ripples there is a difference between them. Bi-directional ripples are rarely symmetrical due to the difference in force of the two directions, where as the wave formed or oscillation ripples form from the circular water movement pattern of water molecules.

  6. Depositional environment - Wikipedia

    en.wikipedia.org/wiki/Depositional_environment

    A diagram of various depositional environments. In geology, depositional environment or sedimentary environment describes the combination of physical, chemical, and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record.

  7. Siding-vinyl windows company closing Pierce County site ... - AOL

    www.aol.com/siding-vinyl-windows-company-closing...

    A screenshot from Associated Materials’ website on Tuesday, Jan. 14. The vinyl window and siding company this week filed notice with the state of Washington about the closure of its Fife facility.

  8. Paleocurrent - Wikipedia

    en.wikipedia.org/wiki/Paleocurrent

    Bidirectional wave ripple, Nomgon, Mongolia. A paleocurrent or paleocurrent indicator is a geological feature (typically a sedimentary structure) that helps one determine the direction of flowing water in the geologic past. This is an invaluable tool in the reconstruction of ancient depositional environments. [1]

  9. Way up structure - Wikipedia

    en.wikipedia.org/wiki/Way_up_structure

    A way up structure, way up criterion, or geopetal indicator is a characteristic relationship observed in a sedimentary or volcanic rock, or sequence of rocks, that makes it possible to determine whether they are the right way up (i.e. in the attitude in which they were originally deposited, also known as "stratigraphic up" or "younging upwards") or have been overturned by subsequent deformation.

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