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National Geologic Map Database

Geologic Unit: Marble Falls

Usage:

Marble Falls Limestone of Bend Group (TX*)
Marble Falls Formation of Bend Group (TX)
Marble Falls Group (TX)


Subunits:

GROUP STATUS (alphabetical) --all in TX: Big Saline Formation, Sloan Formation.
FORMATION STATUS (alphabetical) --all in TX: Big Saline Member, Gibbons Conglomerate Lentil, Lemons Bluff Member, Sloan Member.


Geologic age:

Pennsylvanian, Early*
Pennsylvanian, Middle*


Type section, locality, area and/or origin of name:

Exposure along banks of Colorado River from dam at Marble Falls to base of strata 1 mi below highway bridge at Marble Falls, Burnet Co., central TX.


AAPG geologic province:

Llano uplift*
Bend arch*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).