Fossils in lower layers are older than those occurring in overlying strata.
Only index fossils can be used in correlation
Are from 1-950 Km in diameters.
Circle the sun like planets.
Located between the orbits of Mars and JupiterIrregular in shape and composition.
Which of the following is correct about terrestrial planets
The Fore-reef consists of:
Which of the following was responsible for Late Ordovician extinctions:
a. Onverwacht and Fig tree groups in South Africa.
The largest of all modern examples oforganic reefs is:
The GreatBarrier Reef of Australia.
A classic Devonian reef complex isexposed in:
. Indiana limestone is made almostentirely of the shells of:
The first mountain building episodesin N. America is :
Avalonia microcontinent rifted from___________during the Early Ordovician and was carried towards North America.
St. Peter sandstone consists offine-to-medium-size, well-rounded quartz grains with frosted surfacesindicating:
Cow head breccia from west coast of Newfoundl showing extreme tectonic uplift andsubsidence was taking place during the early phases of :
Modern reefs form in warm shallow seas between latitudes:
30o Nand 30 o S.
suturing of Laurasia and Gondwanaland.
TheCatskill Clastic Wedge is a result of erosion from uplifted highlands formedduring the
inan oxygen-deficient environment.
upliftof crustal blocks along extensive vertical reverse faults.
TheChattanooga Formation is composed of
lateDevonian to Early Mississippian black shales.
Cassiar Orogeny, Sonoma Orogeny
Duringthe Devonian, subduction of oceanic lithosphere beneath the western margin ofthe continent was initiated resulting in the beginning of a disturbance knownas
Erosionof layers of sediment deposited on the Kaskaskia sea floor began, only to beinterrupted by the advance of a second sea, the Absaroka Sea.
Anepisode of mountain building in the northern Appalachians during the DevonianPeriod.
Runs from the Gulf ofCalifornia to northern CaliforniaTransportsthe Pacific Plate northwest relative to the North American Plate
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