(DSM #M76 and #M172) These interal casts show the shape of the inside of a cavity such as a shell or brain. When you have an imprint of the outside of an organism it is calleda mold.
(DSM #3055) This horse tooth has tooth marks from a rodent that gnawed on the tooth after the horse died. Rodents chew on hard items to keep their teeth healthy.
This drawing will help you learn the different parts of a crinoid. Crinoids often disarticulate (fall apart) when they die so you are most likely to find individual stem pieces or pieces of calyx.
This drawing will help you learn the different parts of a clam. The beak and teeth are usually the thickest part of th clam so that is the area that is most often preserved. Steinkerns (internal molds) are quite common.