Contains many illustrations of common north Texas [Cretaceous] fossils.
GLOSSARY
Amber—a hard, yellowish, translucent, fossilized plant resin.
Ammonite—ammonoid [cephalopod] with complexly wrinkled [suture] pattern; member of subclass Ammonoidea.
Anterior—front or fore.
Anus—the terminal opening of the alimentary canal, through which waste matter is discarded from the body.
Aperture—the opening of shells, cells, etc.
Aragonite—calcium carbonate (CaCO₃) crystallizing in a different form than [calcite]. In shells it is chalky and opaque; is less stable than calcite.
Archeozoic—the oldest known geological era; early [Precambrian] time.
Articulated—joined by interlocking processes or by teeth and sockets.