ERS111H5S Lecture Notes - Lecture 9: Ediacaran Biota, Grypania, Snowball Earth

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8 Nov 2018
School
Department
Course
Professor
Marc Laflamme guest lecture
Archaen fossils: stromatolites
Modern world these are rare
Represent layers of cyanobacteria
Use light as a guide, so they form upwards in layers
Eventually grow into large complexes
Stromatolites are not as common anymore because they get fed on by other
animals
3 major domains
Bacteria
Archaea - complex, specialized
Eukaryota - animals, plants, fungi
Eukaryotes: increasing complexity
Uni vs multicellular
Prokaryote vs eukaryote
Membrane around nucleus
Complex organelles
Asexual and sexual reproduction
Precambrian eukaryotes
Grypania
Neoproterozoic
A world in flux: supercontinent rodinia
A world in flux: snowball earth
For roughly 50 million years
Ediacara biota
Precambrian
Soft bodied
Primitive animals
Complex organisms and ecosystems
Primitive animals
Extinct organisms: rangeomorphs
Modular, repetitive branching
Feeding unit: lacking a mouth, gut, tentacles, or pores
Deep and shallow water settings
Australia, England, northern Canada
Mistaken point, newfoundland
World heritage site
Stomatolite reefs
Animal reefs
Organisms that built a shell and reefs
545 million years ago
First time animals started to construct and dominate their ecosystems
Animal traces
539 million years ago
Behaviour of animals trapped in a rock
Digging trails and fossilized feces and mucus
Week 9: thursday
Tuesday, November 6, 2018
12:44 PM
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