| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 1,779,911,207 visitors served. |
|
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
Middle Cambrian |
Also found in: Wikipedia | 0.02 sec. |
|
Middle Cambrian [′mid·əl ′kam·brē·ən] (geology) The geologic epoch occurring between Upper and Lower Cambrian, beginning approximately 540,000,000 years ago. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
|
| ? Mentioned in | ? References in periodicals archive | |
|---|---|---|
Simon Conway Morris of the University of Cambridge in England reports that one type of Ediacaran organism, known as Charniodiscus, bears a close resemblance to a newly identified animal from the Burgess Shale, a fossil site dating to the middle Cambrian period, roughly 520 million years ago. The black shales forming the detached, imbricated allochthonous blocks can be subdivided into those belonging to the Middle Cambrian and Upper Cambrian, with the highest grades of mineralisation occurring in the Upper Cambrian black shales. The well-preserved remains of more than 100 species of arthropods (invertebrates such as insects, scorpions and millipedes), sponges and other creatures, embedded in the Burgess shale since the Middle Cambrian 530 million years ago, provided scientists with a distinctly rare glimpse of life near its very beginnings. |
| Encyclopedia |
| Free Tools: |
For surfers:
Free toolbar & extensions |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|