Question: Which is younger than the broadleaf fossil?

Intrusion X is older than the clam and broadleaf fossils. Intrusion X is younger than the broadleaf and fern fossils.

Which fossil is most likely the youngest?

The law of superposition states that rock strata (layers) farthest from the ground surface are the oldest (formed first) and rock strata (layers) closest to the ground surface are the youngest (formed most recently). A fossil is the remains or traces of plants and animals that lived long ago.

Which fossil is the oldest which fossil is the youngest?

The oldest layers are on the bottom, and the youngest layers are on the top. Because sediments sometimes include once-living organisms, sedimentary rock often contains a lot of fossils. Fossils are once-living organisms that have been turned into rock, in which the shape or form of the organism can still be seen.

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Which fossil sequence is in order from oldest to youngest?

The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.

Which is younger the fault or the intrusion?

The principle of cross-cutting relationships states that a fault or intrusion is younger than the rocks that it cuts through. The fault cuts through all three sedimentary rock layers (A, B, and C) and also the intrusion (D). So the fault must be the youngest feature.

Which rock layer is oldest?

The bottom layer of rock forms first, which means it is oldest. Each layer above that is younger, and the top layer is youngest of all.

What is the oldest fossil discovered so far?

Scientists discovered what they thought were 3.5 billion-year-old fossils in western Australia almost 40 years ago. A new study reveals that these rocks did indeed contain organic life — making them the oldest fossils ever found.

What was the first fossil found?

In 1861 the first specimen of Archaeopteryx, an animal with both teeth and feathers and a mix of other reptilian and avian features, was discovered in a limestone quarry in Bavaria and described by Richard Owen. Another would be found in the late 1870s and put on display at the Natural History Museum, Berlin in 1881.

Is Trilobite older than Ammonite?

Trilobites are a well-known fossil group of extinct marine animals which became extinct about 250 million years ago. … Ammonites are another extinct group of marine invertebrates.

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Where was the first human fossil found?

It is widely accepted that our species evolved in Africa—the oldest known Homo sapiens fossils were found in Morocco and date back 315,000 years ago—and first ventured out of the continent between 70,000 and 60,000 years ago.

Which life forms existed on Earth for the shortest period of time?

Answer: The dinosaurs existed on Earth for the shortest period of time.

Which is the oldest layer in this outcrop?

The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.

What type of rock is mostly used in radiometric dating?

Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years. So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil.

What are the three major types of unconformities?

There are three kinds of unconformities: disconformities, nonconformities, and angular unconformities.

Is the fault older or younger?

A fault is a break in Earth’s crust. A fault is always younger than the rock it cuts through. The surface where new rock layers meet a much older rock surface beneath them is called an unconformity.

Are extrusions older or younger?

The extrusion is younger because extrusions are always younger than the rock layers below them.

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Archeology with a shovel