| A | B |
|---|
| Bivalves | 2 shelled animals such as clams and oysters.,  |
| clastic | Fragments of a pre-existing rock or mineral that may be of any size. Clastic rocks are composed of clasts (larger pieces of rock) that have been cemented together by another fine grained sediment.,  |
| Ejecta | material thrown out from the crater after the impact,  |
| Foraminifera | (forams for short) are single-celled protists with shells. Their appearance in the fossil record can be used to date rocks. In many Marine ecosystems, Foraminifera are the base of the food chain. (microscopic),  |
| Iridium | an element that is very rare in the crust of the earth but relatively abundant in certain asteroids,  |
| Shocked quartz | quartz that has experienced enormous shock and pressure causing it to form microscopic lines that follow its internal crystal structure. Typically these lines intersect at some angle and are obvious under the microscope.,  |
| Spheroid | Fragments of rock that have been rounded due to partial melting in a blast cloud.,  |
| Spherules | particles of melted rock thrown out from an impact that harden into tiny, glassy spheres.,  |
| KT Boundary | The K–T boundary is a geological signature, usually a thin band, dated to 65.5 million years ago. K is the traditional abbreviation for the Cretaceous period, and T is the abbreviation for the Tertiary period. The boundary marks the end of the Mesozoic era and the beginning of the Cenozoic era, and is associated with the Cretaceous–Tertiary extinction event, a mass extinction.,  |
| stratigraphy | Stratigraphy is a branch of geology which studies rock layers and layering (stratification),  |
