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Snapshots

  1. 1

    Snapshot Title: 1
    Taken by: omega

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    1



  2. Quaternary river alluvium

    Snapshot Title: Quaternary river alluvium
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    Sharp unconformity between young Colorado River sediment (maybe 60 ka) and the Bullhead alluvium.



  3. sharp erosional contact

    Snapshot Title: sharp erosional contact
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    The contact between the Newberry gravels and the underlying fanglomerate is very sharp. Note the irregular base of the gravels and look for complex bedding patterns typical of channelized flow deposit...



  4. clasts of megacrystic granite

    Snapshot Title: clasts of megacrystic granite
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    The granite clasts are purple-brown and have large feldspar crystals.



  5. Bullhead Alluvium

    Snapshot Title: Bullhead Alluvium
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    The Bullhead alluvium is the first (thus oldest) Colorado River deposit in the valley. It fills deeply gouged erosional topography that cuts across all older units. Exposures just down the gulch in th...



  6. The Newberry Gravel

    Snapshot Title: The Newberry Gravel
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    The Newberry gravel occupies distinctive paleochannels that truncate the underlying fanglomerate, which has the same clast composition. The orientation of the paleochannels is roughly perpendicular to...



  7. The Pyramid Gravel

    Snapshot Title: The Pyramid Gravel
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    The Pyramid Gravel is a nearly monomictic cobble-boulder conglomerate (a coarse gravel deposit dominated by clasts of a single composition) that records the catastrophic failure of a bedrock divide be...



  8. Bouse Formation

    Snapshot Title: Bouse Formation
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    Calcareous, chalky mud of the Bouse Formation (the Bouse limestone or Bouse marl). This key unit marks the existence of a large lake that filled the valley immediately prior to the development of the ...



  9. Pliocene river gravel lens

    Snapshot Title: Pliocene river gravel lens
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    Interesting 'football' of cemented pea gravel. This is part of the Bullhead alluvium which dates to between 5.59 and 4.1 million years old.



  10. Bouse Formation

    Snapshot Title: Bouse Formation
    Taken by: Kyle House

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    Calcareous mudstone and sandstone of the Bouse Formation



  11. Bottle

    Snapshot Title: Bottle
    Taken by: Peter

    Image: Birth of the lower Colorado River near Laughlin Nevada
    Image Owner: Kyle House



    Description:

    ,