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What happens to sediments after a million years?
After a million years, sediments can undergo diagenesis, which includes compaction and cementation. This process transforms loose sediments into solid rocks like sandstone, shale, or limestone. Over time, these rocks may be uplifted and exposed at the Earth's surface by tectonic forces.
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.
What era is the entrada sandstone in Arches National Park?
The Entrada sandstone was deposited 300 million years ago, in the Jurassic period.
What types of strata rocks and fossils would've been found in West Virginia 100 million years ago?
West Virginia 100 million years ago would have been part of a shallow seaway, so you would find marine sedimentary rocks like limestone, sandstone, and shale. Fossils of marine life such as ammonites, bivalves, brachiopods, and possibly marine reptiles like mosasaurs might be discovered in these rocks.
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?
550 million years old
What materials were used at Stonehenge?
The outcrop sedimentary rocks at Stonehenge are the Late Cretaceous, Santonian Age, calcium carbonates. The outcrop sedimentary rocks comprise the first construction material used by the Stonehenge builders. This material is approximately 85 million years old. These rocks are locally called the Seaford Chalk Formation (Stonehenge White Chalk). The oldest limestone sedimentary rocks at Stonehenge are the Mississippian Period (Early Carboniferous), Arundian Age, calcium carbonates. The Mississippian Period limestone sedimentary rocks comprise the first (1st) foreign construction material used by the Stonehenge builders. This material is approximately 340 million years old. These rocks are locally called the Birnbeck Limestone Formation (Stonehenge Whitestones). The volcanic rocks (oldest geologically) at Stonehenge are the Ordovician Period intrusive igneous diabases (dolerites), and extrusive igneous felsites (rhyolites) and tuffs (basic). The Ordovician Period igneous rocks comprise the second (2nd) foreign construction material used by the Stonehenge builders. This material is approximately 470 million years old. These rocks are locally called the Ordovician Volcanics (Stonehenge Bluestones). The oldest sandstone sedimentary rocks at Stonehenge are the Silurian and Devonian Period micaceous sandstones. The Silurian and Devonian Period sedimentary sandstone rocks comprise the third (3rd) foreign construction material used by the Stonehenge builders. This material is approximately 417 million years old. These rocks are locally called the Old Red Sandstone Formation (Stonehenge Coshestons). The youngest sandstone sedimentary rocks at Stonehenge are the Oligocene and Miocene Period silicates. The Oligocene and Miocene Period sandstone sedimentary rocks comprise the fourth (4th) foreign construction material used by the Stonehenge builders. This material is approximately 24 million years old. These rocks are locally called the Reading Formation (Stonehenge Sarsens). http://www.bgs.ac.uk
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
If a layer of sandstone lies on top of a layer of limestone in which a 300-million-year-old fossil is found and there are no unconformities the layer of sandstone must be what?
The layer of sandstone must be younger than the layer of limestone, which contains the 300-million-year-old fossil. Since there are no unconformities, the sandstone was deposited after the limestone, meaning it formed after the fossilizing event of the limestone layer. Therefore, the sandstone is younger than 300 million years old.
Rocks in ocean crust are as old as?
200 million
Are rocks and minerals pure substances?
No, sandstone is not a pure substance. Sandstone is a mixture of eroded rock particles (grains of sand) that have been put under pressure over millions of years until they have formed a solid (sandstone) rock layer.Sandstone is a sedimentary rock, mainly of sand-sized mineral particles or rock fragments. Sandstone is mainly composed of quartz or feldspar.
What is the most common rock type in Michigan?
The most common rock type in Michigan is sedimentary rock, particularly limestone, shale, and sandstone. These rocks were formed from the accumulation and compaction of sediments over millions of years.
If a layer of sandstone lies on top of a layer of limestone in which a 300-million-year-old fossil is found and there are no unconformities the layer of sandstone must be .?
The layer of sandstone must be younger than the layer of limestone. Since the limestone contains a 300-million-year-old fossil, it indicates that the limestone is older than 300 million years. Therefore, the sandstone, which lies on top without any unconformities, must have formed after the limestone was deposited.
