Geology of the San Juan Basin, New Mexico

Matthew DixonEmil Johnson

Is coal bearing bedrock formation Formerly known as the callop formation The Dalton Sandstone unit Non-Marine Unit

Crevasse Canyon

Late Jurassic 86.5 thickness Upper 15 meters Gryphea Layer Represents a Transgressive Deposit Transgressive deposits Oil and Gas producing Trapping Methods Unknown

Dakota Sandstone

Early Cretaceous Is the Bulk of Marine Deposits in the San

Juan Basin Shale's have Fractured due to Stress 13,000,000

Mancos Shale

Overlays the Mancos Cretaceous Aged Shows a Steep Regression “Regression Gallop” Unconformity Separates upper “Transgressive

Gallop” Oil and Gas Producing’ 140,000,000 350,000,000 MCF (per thousand cubic feet”

Gallop Sandstone

Point Lookout Sandstone, Transgressive Cliff House, Menefee Formation

Point lookout lamented sandstone; traces carboniferous shale's

Cliff House Similar; more porous Also unknown trapping method for Oil and

Gas

Mesaverde Group

Upwards Transitions from Fluvial sandstones to Shale's

Coal Beds; lagoon environment Fossils (crocs and cretaceous turtles;

Dinosaurs

Menefee

Highest Unit in Cretaceous Age; 75-70 million years

Only 10-16 meters thick Not good oil producer; 55,000 Gas over 870,530.767 MCF Traps Lewis Shale

Pictured Cliffs