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answer 2 In Ediacara, Australia, appear very early soft bodied fossil shapes in the fine shale. These date from 635 Mya to 540Mya. These are thought have appeared soon after emergence from the cryrogenic period of rather chilly Earth's history. They flourished into the pre Cambrian period.
The Burgess Shale beds of N America are also prolific record to very early (pre) Cambrian fossils.
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Even earlier was the emergence of algae, and these have left their mark in India's Vindhya region with dates of 1.6 - 1.7 Gya. (The Earth has an age of about 4.5 Gy.)
We know that the emergence of algae caused a collapse of CO2 and Methane in the Earth's history, and this reverse greenhouse effect pushed the world into a snowball earth condition for perhaps a billion years. The oxygen these early algae produced, oxidized the dissolved iron in the seas, and precipitated it as the 'banded iron beds' of commercial importance today. Portions of these may be analysed for age and O2 content. [Gya = 109 years ago, Mya = 106 years ago.]
The algae survive today, notably as the seaweeds.
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When did the first land plants and animals appear in the fossil record?
The first plants with spores, which indicates that they were land plants, appeared in the Middle Ordovician period, about 470 million years ago. First records of tetrapods, or land animals, show up in the fossil record around 370 million years ago.
When did abundant fossil evidence first appear in the geologic record?
The first abundant fossil evidence first appeared during the Paleozoic Era. It was the first era of the Phanerozoic Eon, which occurred 540 million years ago.
What are two things that scientists learn from the fossils record?
The fossil record provides evidence about the history of life and past environment on earth. The fossil record also shows that different groups of organism have changed over time.
What is the definition of range of a fossil species?
The range would be the span of time between the point in the geologic record the fossil organism first appeared to the point in the geologic record that the organism last appeared.
In what type of rock do most fossils appear?
Rarely a fossil may appear in metamorphic or igneous rock, but the vast majority of fossil evidence presents itself in sedimentary rock. Remains or evidences of life are often preserved by being covered in sediments before decaying or being consumed by predators. The sediments may turn to rock through the process of lithification over time, leaving a record of their presence.Limestone - by far
When did the Equus first appear in the fossil record?
when did the equus frist appear in the fossil record
When did the first land plants and animals appear in the fossil record?
The first plants with spores, which indicates that they were land plants, appeared in the Middle Ordovician period, about 470 million years ago. First records of tetrapods, or land animals, show up in the fossil record around 370 million years ago.
Why is the fossil record unable to provide a full portrait of the times in which the fossilized animals and plants lived?
The fossil record is incomplete.
Why is the fossil record unable to provide a full portrait of the times in which the fossilized animals and plants live?
The fossil record is incomplete.
Is the fossil record complete?
No, the fossil record is not complete. Not all animals and plants were fossilized during the last 4 billion years of the earths existence.
What link do seed ferns represent in fossil record?
The first fossil records of vascular plants that is land plants with vascular tissues Fossil ferns and seed ferns include Pecopteris Cyclopteris
When did abundant fossil evidence appear in the geologic record?
540 Million years ago
What was the first key hominid trait to appear in the fossil record?
The first key hominid trait to appear in the fossil record is bipedalism, which refers to the ability to walk upright on two feet. This adaptation is characteristic of early hominids and distinguishes them from their primate ancestors.
Which organisms have produced the oldest fossil evidence?
Cyanobacteria are the first to appear in the fossil record.
What modern form of Homo sapiens first existed about what years ago?
Anatomically modern humans first appear in the fossil record in Africa about 195,000 years ago.
Are fossils records complete or incomplete?
Fossil records are not complete. By some estimates, less than 1% of organisms that have lived appear in the fossil record.
Is the fossil complete?
No, the fossil record is not complete. Not all animals and plants were fossilized during the last 4 billion years of the earths existence.
