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Field Trip: A Tour of Jurassic Lake T’oo’dichi: Alkaline, Saline Wetlands of the Morrison Formation in the Four Corners Area

September 23, 2023 - September 24, 2023

Dates:  September 23-24th (2 days / 1 night)

Leaders: Dr. Christine Turner and Mr. Neil Fishman. Retired USGS

Limit: 18 FCGS Members

Registration: Opens 9am on June 30th online only. Link will be posted below.

Price: $125 base fee with additional lodging. Add  $113.40, $56.70 or $15.75 according to your lodging choice (private or shared room at Recapture Lodge or camping at Sand Island).

Includes: Transportation, Saturday and Sunday lunches, Group dinner on Saturday night, Four Corners Monument entrance fee, Navajo Nation permit and your lodging choice. Sunday breakfast included at Recapture Lodge. Campers will cook a group breakfast on Sunday.

Cancellation: Cancel with full refund by August 23rd. Cancel with 50% refund through September 5th.

Trip Drop Date: Trip will be cancelled on September 6th if minimum registration not reached. Registration fees refunded in full if this happens.


What rock formation is green, purple, orange and blue, known for dinosaur fossils and hosts uranium?  The Morrison Formation!  It’s all around us in the Four Corners Area, but how much do we really know about the depositional systems that formed it? Join us as we travel from the interior to the margins of the oldest, largest, alkaline, saline wetland in the geologic record with retired USGS geologists Dr. Christine Turner and Neil Fishman. In their interpretation, unusual pore water chemistry related to the alteration of silicic ash from calderas to the west resulted in a diagenetically zoned distribution of zeolitic minerals in the Brushy Basin Member only found west of the Uncompahgre uplift. We will also observe and discuss the tectonic, stratigraphic and sedimentologic aspects of the entire Morrison (including the Salt Wash and Bluff Sandstone Members) as we traverse the depositional basin in the greater Four Corners region.

For more information open this pdf: FCGS Morrison FT Updated 29June2023

Link to Morrison Field Trip registration form:

Link to Morrison Field Trip waiting list form:


September 23, 2023
September 24, 2023