0
== == The age of a sedimentary rock formation can be estimated by comparing it to radiometrically dated rock formations that contain the same fossil organisms. Geologic time categories have been identified according to the radiometric dating of fossils and the fact that they appear only in certain time periods. Therefore, if you look at a rock formation and find a trilobite fossil that has been identified by previous dating techniques as Cambrian, you can be fairly certain that the formation you are looking at is also Cambrian.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoThere are 3 types of rock. Sedimentary, Igneous and Metamorphic.
Sedimentary are accumulated sediments laid down in water or on land that are then buried and solidified. Igneous rocks are volcanic and were by definition at one stage molten (liquid). Metamorphic rocks were originally either Igneous or Sedimentary rocks that have then been changed over time to a different composition by the effects of heat and/or pressure
Wiki User
∙ 11y agoThey date the igneous intrusions and extrusions near the sedimentary rock layers.
Wiki User
∙ 11y agoCount their layers and see how much layers they have and that is how old they are in years.
Add your answer:
Earn +20 pts
What features of sedimentary rocks are unlikely to be found in metamorphic rocks what features of metamorphic rocks do not occur in sedimentary rocks?
ftygghhjgg
What is the or-gin of sedimentary rocks?
weathering of preexisting rocks form clastic sedimentary rocks, Oversaturated water basins form chemical sedimentary rocks after the water evaporates and dead sea organisms settle at the bottom forming biochemical sedimentary rocks.
Why do sedimentary rocks erode faster than others?
Sedimentary rocks tend to erode easily compared to other types of rocks as the grains within them are farther apart than the "grains" in, let's say, igneous rocks. As a result of this, the "grains" can be easily crumble. An example of this is sand.
Are sedimentary rocks chemically weathered?
Sedimentary rocks can be both chemically and mechanically weathered.
Is sedimentary rocks formed the same way normal rocks are?
No, because a sedimentary rock is formed from pieces of other rocks.
Rocks formed from weathered debris from preexisisting rocks are called?
They are called clastic sedimentary rocks.
Can large areas be covered with layers of sedimentary rocks?
Yes, massive areas of Earth are covered by sedimentary rocks. A good geology map will tell you what rocks are in your area.
Are sedimentary rocks classified tofoliated sedimentary rocks?
Metamorphic rocks are classified by foliation or lack there of, not sedimentary rocks. They are classified into Clastic Sedimentary, and Chemical Sedimentary.
Are sedimentary rocks formed from fragments of other rocks chemical sedimentary rocks?
No. The rocks you describe are clastic or detrital sedimentary rocks.
What has the author Sam Boggs written?
Sam Boggs has written: 'Petrology of sedimentary rocks' -- subject(s): Sedimentary Rocks 'Petrology of sedimentary rocks' -- subject(s): Rocks, Sedimentary, Sedimentary Rocks
Are sedimentary rocks dark?
Some are, such as slate or coal. Others are not, such as chalk or halite.
Are there any fossils in sedimentary rocks?
Yes all fossils occur in sedimentary rocks or rocks that began as sedimentary rocks.
What rocks are formed when sediments are compressed compacted and cemented togerther?
Sedimentary rocks.
What kind of rocks are caused by weathering?
The most common rock that experiences weathering, is sedimentary rocks. Metamorphic and Igneous are unlikey to.
What features tell you how a sedimentary rocked is layered?
Sedimentary rocks are often deposited in layers as strata. The feature that tells how a sedimentary rock is layered is called the bedding.
What rocks are formed from broken rocks?
Clastic sedimentary rocks and Cataclasites (a form of metamorphic rock) are formed from broken rocks.
Sedimentary rocks formed when they undergo?
Sedimentary rocks form when they undergo metamorphism. Only if they decide NOT to be Sedimentary rocks anymore.
