These fast-moving low-level epifaunal carnivores lived during the middle Devonian and Ordovician periods from 460.9 to 383.7 Ma.
32.
These layers were the result of an Ordovician Period sea which covered east-central Minnesota 500 million years ago.
33.
It was caused by a ca . 200-meter-wide meteorite impact during the Middle Ordovician Period, 470 million years ago.
34.
The land around the Chronister home and dig site sits atop sandstone from the Lower Ordovician Period or Canadian Epoch.
35.
An algal scum formed on the land, but it was not until the Ordovician Period, around, that land plants appeared.
36.
The Ordovician Period in Britain was traditionally broken into Early ( Tremadocian and Arenig ), Middle ( Ashgill ) epochs.
37.
It lived during the later part of the Arenig stage of the Ordovician Period, approximately 478 to 471 million years ago.
38.
Tennessee marble was formed from the accumulation of bryozoan and other primordial marine lifeforms 460 million years ago, during the Ordovician period.
39.
The major rocks of the Kitzb�hel Alps divide into two groups by age, the older rocks probably dating to the Ordovician period.
40.
The Taconic mountain range was formed from the collision of the North American Plate into a Ordovician period, around 440 million years ago.
