It has a fine grain and is usually found below sandstone, not on the surface. Shale was formed from fine silt and clay. It is made of calcium carbonate. It fizzles when it comes in contact with vinegar or any other acid. Coquina is a type of limestone that is mostly made of shells and shell fragment.
Dolomite is another type of limestone.
Sedimentary rock layers that were formed in water frequently has ripple marks. Sedimentary rock layers that have crackles from drying mud were formed in shallow water that evaporated. Knowing the environmental conditions at the time the rock was formed tells you a lot about what type of fossils may be within the rock layer. As stated in our privacy policy , we fully respect your privacy and will not use your e-mail address for any purpose other than the newsletter subscription. Search the Web with our sponsor, Overture.