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Is a limestone bed containing fossils that are 550 million years old older than a bed of sandstone containing fossils that are 400 million years old?
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∙ 13y ago
550 million years old
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∙ 13y ago
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How long have gars been on earth?
Gar fossils are known from the late Cretaceous Period, around 65 million years ago.
How old is a tropite fossil?
The rock surrounding it is 68 to 230 million years ago. If you found a phacops fossils the rock surrounding it is 400 million years old.
Cyanobacteria fossils can be dated back to the what while fossils of icthyosaurs indicate that they live during the what?
Cyanobacteria fossils are the oldest known fossils on Earth. Stromatolites found near Shark Bay, Western Australia, which are made by cyanobacteria, have been dated back to 3.5 billion years in the Paleoarchean Era . They survive to modern day. Identical stromatolites are being formed not 15 miles from there 3.5 billion year old fossilised ancestors. Icthyosaurs on the other had appeared in the fossil record about 245 million years ago in the Middle Triassic Epoch. They died out about 90 million years ago in the Upper Cretaceous Epoch, about 25 million years before the KT extinction that saw the deaths of the other great marine reptiles the mosasaurs and the pleisoasurs as well as all non avian dinosaurs.
How do you know that sharks are older than dinosaurs?
Fossils of sharks have been found dating back to the Silurian period, more than 200 million years before the first dinosaurs.
Do cats originate from lions?
No. In fact it is the other way around. Genetically, larger tends to come from smaller - animals grow larger as they evolve, rather than growing smaller. Fossils exist for the smaller cats from 10 million years ago. Lion fossils are much more recent - less than 1 million years old. The lynx is about 4 million, the cheetah 2.5, the jaguar and the leopard are about 2 million and tigers more recent still. As can be seen there is a growth pattern in those trends, with the larger cats arriving later than the small ones.
How old is the supai layer?
The Supai layer is approximately 285 million years old. The Supai layer forms the surface of the Coconino and the Kaibab plateaus. It is composed major of limestone and sandstone.
Discuss how to find the oldest paper in a stack of papers?
1. discuss:how to find the oldest paper in a stack of papers. 2. explain:the concept of relative age. 3. illustrate:a disconformity. 4. describe:one way to correlate similar rock layers. 5. think critically:explain the relationship between the concept of relative age and the principe of superposition. 6. interpret data:to determine the oldest rock bed.a sandstone contains a 44-million-year-old fossil.a shale has fossils that are over 55 million years old.a limestone,below the sandstone,contains fossills between 400 million and 500 million years old.which rock bed is oldest?explain.
Did dinosaurs live in virginia?
NoAnswer:At the present time no dinosaur fossils have been found in Virginia, However the coal beds and limestone rocks exhibit dinosaur tracks and other trace fossils which indicate their presence in the Triassic period (220 million years ago)
How old are the Ural mountains?
The Ural Mountains are estimated to be around 250 to 300 million years old, making them relatively young in terms of geological history.
Can fossils be used as index fossils?
Yes, index fossils are special fossils that act as geological tools enabling comparison in time of a range of geological units and environment. Normally, they are selected using certain attributes such as the fossil should be widespread, abundant, fast evolving, and independent of their environment.
Which does not belong shale basalt sand stone or limestone?
In the question "which does not belong; shale, basalt, sandstone, or limestone?" the answer is Basalt. Shale, Sandstone, and Limestone are all sedimentary rocks. Basalt is an Igneous rock. Shale and Sandstone are both clastic sedimentary rocks which means they come from the "pieces" or remains of rocks after weathering. Limestone is a chemical sedimentary rock which means it is deposited as a result of a chemical reaction, or a collection of material made by organisms, such as coral. volcanic basalt dykes are molten basalt that rose through existing sedimentary rock, and crystallized when it rose to the surface about 32 million years ago. The magma cools and hardens which creats a basalt stack, resistant to weather. Basalt is a common extrusive volcanic rock.It color is usually gray or close to black.
How old is Grand Canyon National Park?
2 billon years old
What era is the entrada sandstone in Arches National Park?
The Entrada sandstone was deposited 300 million years ago, in the Jurassic period.
Why there are no human fossils in coal?
Coal fossils formation begin about 60 million to 290 million years ago (before human existence) therefore no human fossils are found in coal.
Does an outcrop containing Jurassic dinosaur fossils overlying Pennsylvanian coal deposits represent uninterrupted deposition?
No, you are missing about 70 million years. The Triassic period and Permian are between the Pennsylvanian and the Jurassic.
What are the different types of rocks in the Grand Canyon?
Precambrian Basement Rock - formed 1.8 billion years ago when the continent collided with a group of volcanic islands; intense heat and pressure from the collision formed the metamorphic rock called Vishnu Schist.Molten rock from deep within the earth flowed up between the layers of Vishnu Schist to form igneous rock called Zoroaster Granite.Bright Angel Shale is found in the flat plateau called the Tonto Platform - formed 515 million years ago when the area was covered by a warm, shallow sea.Redwall Limestone - 340 million years ago; up to 500 feet thick; formed beneath another shallow sea.Supai Group - shales, limestones and sandstones formed 300 million years ago as the coastline rose and fell.Hermit Shale - formed 280 million years ago when the area was covered by a broad coastal plain.Coconino Sandstone -formed 275 million years ago from coastal sand dunes.Kaibab Limestone - formed 270 million years ago; the youngest rock found at the Grand Canyon
How old is the Navajo mountain?
The uplift that formed the mountain occurred between 20 and 31 million years ago. The sandstone on the uplifted top is Dakota Sandstone from Cretaceous 66-138 million years ago.
