Cambrian animals would have needed more oxygen ... animal called Cloudina had taken over parts of the microbial reef. Rather than spreading out over the ocean floor, these cone-shaped creatures ...

The Cambrian Explosion saw an incredible diversity ... The sponges added to these reef habitats by building supporting skeletons from calcium carbonate, which they collected from the water.

Primitive Sea Life The middle of the Cambrian Period began with an extinction event. Many of the reef-building organisms died out, as well as the most primitive trilobites. One hypothesis suggests ...

And yet they share a common Cambrian chordate ancestor ... Photographed at The Elizabeth Moore International Center for Coral Reef Research & Restoration; Specimen from Florida Keys Marine ...

The Cambrian fossil record has been the subject ... 3; April 2019 These observations are significant because reef building represents an important ecological innovation. By growing closely ...

In these ancient reef systems, dead animals usually were ... As life evolved in the Cambrian explosion, animals filled different ecological niches and adopted different body plans.

Mary Lonsdale Archaeocyaths were the world’s first reef builders. Common just after the Cambrian explosion, archaeocyaths predate reef-building corals by 40 million years. Like their modern ...

This suggests they appeared prior to the Cambrian explosion, a wellspring of diverse life that is generally thought to have driven the proliferation of reef-building. “This succession of rocks ...

Discovery of this reef revealed important changes were happening in lifeforms millions of years before the Cambrian explosion 542 million years ago. Most major forms and body shapes of animals ...

Something dramatic happened about 500 million years ago called the Cambrian "explosion," during which an incredible diversity ...