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Lecture 16

GLGY 307 Lecture Notes - Lecture 16: Cenozoic, Rugosa, Tabulata

Course Code
GLGY 307
M.Dan Georgescu

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Burgess Shale Discovery
Burgess Shale fossils were discovered by Walcott at the very beginning of the XXth
century in British Columbia
It is on e of the most important fossiliferous points all over the world
Sedimentary Environment
The fossils of Burgess Shale were buried along the continental slope and at the slope
o Rapid burial
The fossils of Burgess Shale are found mostly in the dark-colour sediments
o Anoxic conditions
A Reconstruction of the Burgess Shale Biotope
The burgess Shale Middle Cambrian fauna consists of a variety of known and unknown
The First Fossil Fish
An extraordinary discovery came in the 1990s from the Early Cambian fossiliferous beds
from the Chengiang Province of China
Myllokunmingia represents not only the first fossil fish but also the first known vertebrate
2.5 cm wide just below the tentacles
Originally it was assigned to the crinoids (echinoderms)
Later it was shown that it could be an tetracoral
Phylum Cnidaria
Metazones (multicellular organisms) organized in tissue-grade. There are no organs in
their bodies
The characteristic feature of the representatives of this phylum in that they have
nematocysts (cells that discharge a certain amount of poisonous substance capable of
paralyzing or killing the pray)
Body architecture
o Polyp stage
Sessile (fixed to the sea bottom with a root-like structure)
Asexual reproduction by budding
o Medusa stage
Jellyfish-like (free dweller in the oceanic water column)
Sexual reproduction strategy
Cindrian Classification
Phylum Cnidaria
o Class Hydrozoa; marine and fresh-water; hydroids or hydra exist mostly in polyp
stage. Hydrozoans lack a mineralized skeleton and for this reason are rare in the
fossil record. Evolutionary occurrence is in the Late Cretaceous
o Class Scyphozoa; marine in habitat; are rare in the fossil record due to the lack
of hard body parts. Evolutionary occurrence is in the Cambrian
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