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25 Cards in this Set
- Front
- Back
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What does the ordivician time represent? |
The diversification of life |
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What seperates a brachipod from a clam? |
Brachipods are nonsymetrical |
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What type of feeders dominated the cambrian era? How were these feeders different in the ordivician? |
Suspension feeders (sponges) Reached cm into the water column Ordivician tiered Brachipods in the lower few cm and crinoids up to 3 m |
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What was the top predator of the ordivician? |
Cephalopod nautiloids Which grew up to 10 m long Also the sea star |
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What lead to the diversification of life? |
Complex reefs and topography |
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What is the difference between inarticulate and articulate brachipods? |
Inarticulate were dominant in the cambrian and were hed together by a muscle Articulate were dominant in the ordivician and were held together by a complex hinge. |
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What are the 2 types of brachipods and what defines them? |
Both shells composed of calcite |
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What is the first fossil to show up in the ordivician? |
Bryzoans filerfeeding moss animals All share 1 blood vessel Look like coral Have apartments |
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What is a crinoid and what are theyre vertibrates composed of? |
Echinoderms Sea lillies that can walk Calcite |
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When was the first coral reef formed? What are the 2 majortypes of corals? |
Ordovician Rugose corals : horn corals Tabulates : honeycomb |
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What is a stromatoporid? |
Extinct sponge that looks like but ISNT a stromatile |
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True pr false we know what makee receptaculitids? |
Sunflower corals FALSE |
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When did the last gasp for stromatiles occur? What brought theyre demise? |
Ordivician Gastropods |
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What is a graptolite? What defines them? Are they an index fossil? |
They look like they are draw on rocks Ancestors of us Made of long brushes Perservrd in almost every eni0vironment They are an index fossil for the ordivician |
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What index fossil is best for telling the temp the rock reach and is easy to extract? |
Conadonts Little teeth that change color when heated |
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When did the firet definite member of the vertebrates shoe up? |
Ordivician Made mostly of cartilage |
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What fauna defines the paleozoic? |
The brachipod fauna |
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What are the causes of ordivician radiation? |
High sea levels create vast shallow warm seas Oxygen reaches modern levels Evolution kf predators lead to more shells Robust calcite shells vs the phosphate and thin calcite shells of the cambrian |
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What caused the ordivician extinction? What were the repercussions and whom weathered the storm? What other hypothesis for this is there? |
Snowball earth NOT the other hypothesis gamma ray burst 2nd wprst in history worse than the dino one 1/2 of brachipods and bryzoans die out More than 100 families od marine animals dont make it Reefs decimated and make it bacj in silurian Nautiloids decimated Trilobites decline further Tropical animals die Deep sea animals make it Dramtic drop in sea level |
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Ordivician geology in north America |
Huge regression at beginning Erosion of carbonates - karst topography Sandstone depostion common on craton |
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What is the prominant sandstone found in nv from the ordivician |
Euerka quartzite |
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What transgression happens in the later part of the ordivician ? And what type ofnrock is dominant in nv from its transgression? |
The Tippecanoe transgression Ely springs dolomite which is very organic carbonate |
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What evidence do we have for a mountain building process during the ordivician |
Submarine mudflows Vocanic ash Redbeds create clastic wedge and foreland basins |
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What forms adjacent to mtn buioding events |
Foreland basins |
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What orgeny happens in the ordivician? Is this the first of the paleozoic mtn building process? |
Taconic orogeny along the east side of n am it is the first pf the paleozoic |
