1of3 – Animal Armageddon – Death Ray

The extinction occurred 443.7 million years ago, during one of the most significant diversifications in Earth history. It marks the boundary between the Ordovician and following Silurian period. During this extinction event there were several marked changes in biologically responsive carbon and oxygen isotopes. This complexity may indicate several distinct closely spaced events, or particular phases within one event. At the time, most complex multicellular organisms lived in the sea, and around 100 marine families became extinct, covering about 49% of faunal genera (a more reliable estimate than species). The brachiopods and bryozoans were decimated, along with many of the trilobite, conodont and graptolite families.

Suggested Posts

Anthropogenic Effects of Ozone Depletion An informative video on the effects of ozone depletion on humans
Ocean Pollution Images.wmv A series of photographs within a film, without words or text, designed to stimulate discussion of the topic Ocean Pollution....
Non-renewable Energy vs. Renewable Energy My PSA for Environmental Biology.
Compound Microscope Explaining how a compound microscope operates Video Rating: 5 / 5
Environmental Air Pollution – Introduction t... in QuickList Lecture 2 Air Pollution Systems 56:28 Lecture Series on Environmental Air Pollution by Prof. Mukesh Sharma , De...
Fyrose Shaik

Fyrose Shaik is one of the Authors of HourlyBook.

Related Posts
Leave a reply
Captcha Click on image to update the captcha .