Choose one of the following Rocks for more details:
Formed on cave walls, the sides of other formations, and at the edges of pools.
The North American craton was periodically flooded by shallow seas that left behind widespread layers of sediment, which formed a veneer of sedimentary rocks like this dolomitic limestone.
This special type of flowstone called drapery was deposited by water flowing down a cave wall.
Limestone, faulted into blocks. Movement in a fault zone chopped this layered rock into pieces, which tilted like books on a shelf.
Limestone with ammonites
Psiloceras planoribis, Lower Jurassic period. What time is it? If you found this index fossil in a rock, you'd know. The animal was once widespread but quickly became extinct. Only a small percentage of fossils meet these criteria.
An icicle-shaped formation that grew down from a cave roof. Early in their growth, stalactites resemble soda straws.
A pillar-shaped formation that grew up from a cave floor. The drip and flow of water, along with the varying rate of growth, produced this specimen's texture.