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historical geol 5
middle paloezoic
Question | Answer |
---|---|
Taconic land eroded flat | Silurian |
transgression | Phase 1 |
abundant salt deposits developed ~500 m thick | Phase 1 |
shallow epicontinental seas | Phase 1 |
eastern US and Europe | Acadian orogeny |
in Europe the equivalent event | Caledonian orogeny |
collision first in the north - then migrated south | Phase 2 |
regression | Phase 2 |
Late Devonian - expressed in Nevada rocks | orogenic activity |
western US (small scale event) | Antler orogeny |
2. off shore sediments and island arcs thrust on land | Antler orogeny |
D. Climate relatively warm through the Silurian to the later Devonian | Antler orogeny |
high latitude cooler temperatures during the | Devonian |
global climate deteriorated toward the Earth | carboniferous |
glaciation started | Famennian- latest devonian |
necessary before animals can live on land | Silurian Life land plants |
rigid stalk or stem as a support system | Silurian plants |
vascular systems to distribute nutrients | Silurian plants |
leaves to increase surface area | Silurian plants |
reproduction using spores | Silurian plants |
require warm climates | major reef complexes |
corals | major reef complexes |
stromatoporoids and tabulates | major reef complexes |
dominant predator, to 2 meters in size | eurypterid |
major diversity of brachiopods | Silurian life |
nautiloids and crinoids abundant | Silurian life |
fauna flourishing | Ordovician |
trilobites recovery limited | Late Ordovician extinction |
major fish adaptive radiation | vertebrates |
(bony skin fish) in fresh water deposits | ostracoderms |
no jaws | ostracoderms |
armored | ostracoderms |
acanthodians (fish) marine and fresh water | acanthodians |
fins and spines | acanthodians |
scales and jaws | acanthodians |
generally mud-grubbers | acanthodians |
a root system to collect nutrients | Early Devonian plants |
reproduction using spores | Early Devonian plants |
restricted to damp habitats | Early Devonian plants |
branching root systems | Middle Devonian |
first forests | Middle Devonian |
plants widely spread over land | Middle Devonian |
most primitive gymnosperms | Middle Devonian |
first seeds | Middle Devonian |
liberated plants from moist habitats | Middle Devonian |
pollen for reproduction | Middle Devonian |
trees occupied land for the first time | Late Devonian |
spore plant; first tree (30 m) | Archaeopteris |
due to broad leaves to capture sunlight | Archaeopteris |
swimming predators | ammonites |
(Lower Devonian) | Emsian Stage |
spiny brachiopods | Emsian Stage |
conodont high point | Emsian Stage |
animals move on land | Early Devonian |
scorpions | Early Devonian |
flightless insects | Early Devonian |
main guide fossil for GSSPs | conodonts |
Age of the Fishes | Devonian |
sharks | cartilagenous |
rays | cartilagenous |
most successful fish | bony |
lobe finned fish | bony |
direct line to land vertebrates | lobe finned fish |
endo-skeleton - most important | lobe finned fish |
muscular | lobe finned fish |
most fresh water | lobe finned fish |
coelacanths invaded oceans | lobe finned fish |
only remaining relative alive | coelacanths |
includes lungfishes | lobe finned fish |
dominant in later Phanerozoic | ray finned fish |
Late Devonian - land vertebrates | Amphibians |
reason: competition in water was fierce | Amphibians |
lobe finned fish out of water; had a lung | Amphibians |
converted into a walking limb | fin |
found in Greenland rocks; ~60 cm long | ichthyostega |
limited by need of water for reproduction | ichthyostega |
classed by backbone structure | ichthyostega |
- due to necessary support against gravity | ichthyostega |
- one of five greatest in Earth history - maybe | Late Devonian Mass Extinction |
occurred at the Frasnian-Famennian stage boundary | Late Devonian Mass Extinction |
cause unknown - perhaps due to Greenhouse cooling | Late Devonian Mass Extinction |
- resulting from CO2 reduction in the atmosphere by forests | Late Devonian Mass Extinction |
further extinctions due to glaciation | D-C boundary |
Land plants abundant; Trees in the Devonian | Plants |
intense competition from predators | Invertebrates |
trending toward mobile forms | Invertebrates |
Fish advanced; Amphibians on land | Vertebrates |