Figure 20.--Photographs of the north cirque of Groundhog Basin showing features in the Sangre de Cristo Formation, stop 5. To view features at the mouth of Groundhog Basin and south ridgeline, see Fig. 21.

[Photograph of northwest wall, Groundhog Basin, and base of Crestone Conglomerate, above stop 5]

A) Northwestern wall of Groundhog Basin, showing approximate base of Crestone Conglomerate Member. The contact between the Crestone Conglomerate Member and the lower member of the Sangre de Cristo Formation, which interfinger along strike to the north and south, is arbitrarily placed at the base of the lowermost abundant thick conglomerate beds. Features shown below are located below the level of this photograph.

[Photograph of conglomerate-filled channel]

B) Channel filled with cobble and pebble conglomerate in the lower part of the Crestone Conglomerate Member. Man points to base of channel scour. Note crude stratification. Interpreted as streamflood deposit.

[Photograph of interbedded diamictite and sandstone]

C) Interbedded diamictite (dark red) and conglomeratic sandstone (resistant beds) in the lower part of the Crestone Conglomerate Member. Note man in center of photograph, standing on top of sandstone bed. Diamictites interpreted as mudflow deposits; conglomeratic sandstone beds interpreted as sheetflood deposits. Both deposits represent unconfined floods on the active depositional lobe of an alluvial fan. Bedding top to left.

[Photograph of thick diamictite]

D) Thick (15-20 m) diamictite (mudflow conglomerate) in Crestone Conglomerate Member, upper part of cirque, north side of Groundhog Basin. Interval of lenticular beds to left, above diamictite, is composed of sandstone and conglomerate deposited by streams.