Term
|
Definition
| Vascular plants on the land appeared in late ___. |
|
|
Term
|
Definition
| During early ___, the landscape was barren. |
|
|
Term
|
Definition
| The base of the ___ was formerly identified by the first-occurrence of shell-bearing organisms |
|
|
Term
|
Definition
| The base of the Cambrian was formerly identified by the first-occurrence of ___ |
|
|
Term
| trilobites, brachiopods, molluscs, and possibly annelids |
|
Definition
| What were the first shell bearing organisms? |
|
|
Term
| feeding burrows of the trace fossil Phycodes pedum. |
|
Definition
The base of the
Cambrian is now placed
at the oldest occurrence
of ___ |
|
|
