On the Rocks Field Trips: Hygiene Sandstone

Date: October 12, 2019
Time: 9:00 am - 5:00 pm
Location:  Show map
Boulder, Colorado
Boulder, CO 80302
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Trip is sold out! If you would like to be put on the wait list, please contact the RMAG office.

Hygiene Sandstone, Boulder, Colorado

This day trip will visit outcrops of the late Cretaceous Hygiene Sandstone in Boulder County. The Hygiene Sandstone is approximately equivalent to the Shannon Sandstone of the Powder River Basin, and is commonly referred to as Shannon Sandstone in subsurface of the DJ Basin. Historically interpreted as deposits of “offshore bars”, the Hygiene Sandstone is currently interpreted as the easternmost deposits of the Iles Formation (Mesaverde Group) deltaic complex of northwestern Colorado. The apparently isolated sandstone bodies are explained as remnants of deltas deposited during the falling stage or lowstand of a forced regression. Sediment textural and compositional properties, sedimentary structures, and depositional architecture will be analyzed to lead into a discussion of the dominance of tidal processes, deltaic nature and the paleogeographic position of the Hygiene Sandstone. Sedimentary characteristics observed in outcrop will be compared with a core from the DJ Basin.

Trip Details

  • Trip Leaders: Piret Plink-Bjorklund and Mike Genecov, Colorado School of Mines
  • Price: $35.00  (Members only. Not a member? Click here to join.)
  • Registration closes October 9, 2019

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Waiver and Release of Liability

For all RMAG Field Trips, all registrants must fill out and return the Waiver and Release of Liability form to the RMAG office before registration closes for the field trip. Those who fail to turn in the release form will not be permitted to attend the field trip.


Refunds for the October Field Trip are only available until September 28, 2019.

Refunds for all RMAG technical and social events, except luncheons, are only available up to two weeks before the event date. If you are unable to attend, your registration for all RMAG events are transferable. RMAG members may transfer their registration to another RMAG member, and non-members can transfer their registrations to whomever they wish. Should an RMAG member wish to transfer their registration to a non-member, the non-member would need to pay the balance between the member and non-member price.


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