Geologic History-Reference Tables, Pages 8 &9 PART II, DAY TWO 13) List the numb
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Geologic History-Reference Tables, Pages 8 &9 PART II, DAY TWO 13) List the number of years making up the following periods. Also list one important geologle event that occurred during that time period. Age Range (mya) Importam Geologic Evet Quaternary 14) List the Eon, Era, Perlod, and Epoch for each of the following index fossils. The information can be found by 2: locating the picture at the bottom of pg 8 or 9, and 2 Use the letter above the picture along with Time Distribution of Fossils (find the letter then look left to read the Epoch, Period etc.) Erac wlyplaci Period: Epoch Penod Eon: Eon CondorEm Period Perlod: Epoch: 15. List the period of the following Index fossils and the group of organism that is belongs to (as listed vertically on the black lines) eriod Type riod 16. Which four index fossils were lving in the Middle Ordivician? d) 17. List the names of the following index fossils in order from oldest to youngest.Explanation / Answer
As per norms I should answer for first question only
Triassic:
The Triassic is usually separated into Early, Middle, and Late Triassic Epochs, and the corresponding rocks are referred to as Lower, Middle, or Upper Triassic. The faunal stages from the youngest to oldest are:
During the Triassic, almost all the Earth's land mass was concentrated into a single supercontinentcentered more or less on the equator and spanning from pole to pole, called Pangaea ("all the land"). From the east, along the equator, the Tethys sea penetrated Pangaea, causing the Paleo-Tethys Ocean to be closed.
Later in the mid-Triassic a similar sea penetrated along the equator from the west. The remaining shores were surrounded by the world-ocean known as Panthalassa ("all the sea"). All the deep-ocean sediments laid down during the Triassic have disappeared through subduction of oceanic plates; thus, very little is known of the Triassic open ocean.
The supercontinent Pangaea was rifting during the Triassic—especially late in that period—but had not yet separated. The first nonmarine sediments in the rift that marks the initial break-up of Pangaea, which separated New Jersey from Morocco, are of Late Triassic age; in the U.S., these thick sediments comprise the Newark Group.
Because a super-continental mass has less shoreline compared to one broken up, Triassic marine deposits are globally relatively rare, despite their prominence in Western Europe, where the Triassic was first studied. In North America, for example, marine deposits are limited to a few exposures in the west. Thus Triassic stratigraphy is mostly based on organisms that lived in lagoons and hypersaline environments, such as Estheria crustaceans.
Quaternary:
Holocene - 0-0.0117 ma
Pleistocene:
Tarantian - 0.0117 -0.126
Ionian - 0.126-0.781
Calabrian - 0.781 - 1.80
Gelasian - 1.80-02.58
The 2.6 million years of the Quaternary represents the time during which recognizable humans existed. Over this short time period, there has been relatively little change in the distribution of the continents due to plate tectonics.
The Quaternary geological record is preserved in greater detail than that for earlier periods.
The major geographical changes during this time period included the emergence of the Strait of Bosphorusand Skagerrak during glacial epochs, which respectively turned the Black Sea and Baltic Sea into fresh water, followed by their flooding (and return to salt water) by rising sea level; the periodic filling of the English Channel, forming a land bridge between Britain and the European mainland; the periodic closing of the Bering Strait, forming the land bridge between Asia and North America; and the periodic flash flooding of Scablands of the American Northwest by glacial water.
The current extent of Hudson Bay, the Great Lakes and other major lakes of North America are a consequence of the Canadian Shield's readjustment since the last ice age; different shorelines have existed over the course of Quaternary time.
Cambrian:
Cambrian age : 541–485.4 million years ago
Plate reconstructions suggest a global supercontinent, Pannotia, was in the process of breaking up early in the period, with Laurentia (North America), Baltica, and Siberia having separated from the main supercontinent of Gondwana to form isolated land masses. Most continental land was clustered in the Southern Hemisphere at this time, but was drifting north. Large, high-velocity rotational movement of Gondwana appears to have occurred in the Early Cambrian.
With a lack of sea ice – the great glaciers of the Marinoan Snowball Earth were long melted – the sea level was high, which led to large areas of the continents being flooded in warm, shallow seas ideal for sea life. The sea levels fluctuated somewhat, suggesting there were 'ice ages', associated with pulses of expansion and contraction of a south polar ice cap.
In Baltoscandia a Lower Cambrian transgression transformed large swathes of the Sub-Cambrian As peneplaininto a epicontinental sea.
Upper/Late Triassic (Tr3) Rhaetian (208.5 – 201.3 Mya) Norian (227 – 208.5 Mya) Carnian (237– 227 Mya) Middle Triassic (Tr2) Ladinian (242 – 237 Mya) Anisian (247.2 – 242 Mya) Lower/Early Triassic (Scythian) Olenekian (251.2 – 247.2 Mya) Induan (251.902– 251.2 Mya)Related Questions
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