List of Slides for Places with Reef Rocks
Carlsbad Caverns NP
Above ground, the Carlsbad area is
desert
.
The bedrock consists of Permian
reef limestones
.
Guadalupian rocks, limestones and
evaporites (gypsum and salt)
, accumulated during the late Permian.
Unlike many other caves that are produced when carbonic acid dissolves limestone.,
Carlsbad Caverns
formed by the action of sulfuric acid, which originated in oilfield brines.
Flowstone and popcorn
are common secondary features at Carlsbad.
Other features include abundant
stalactites and stalagmites
.
Guadalupe Mtns NP
The
Guadalupe Mountains
consist of faulted and uplifted Permian limestones.
El Capitan is a
1000-ft high cliff
formed from an ancient reef.
Massive tan limestones rich in fossils comprise the
El Capitan Reef Complex
.
Thornton Quarry
Interstate 80
crosses Thornton Quarry south of Chicago.
The quarry is excavating a
Silurian reef complex
.
Structures include an
anticline
at the bottom of the quarry.
Richly fossiliferous, the limestone includes a
brachiopod bed
.
Reef talus
forms part of the limestone of Thornton Quarry.