Since the gastropod is widely spread, it cannot be an index fossil. To be an index fossil, the fossil of the organism must be found in many rock layers. Since the gastropod is not found in every layer, it cannot be an index fossil.
What is the best index fossil?
A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms. That being said, certain land organisms are useful in young rocks and specific regions.
What are gastropod fossils?
Gastropods are snail-like and slug-like invertebrate (lacking a backbone) animals, and are types of mollusks. Snails have hard mineral shells; slugs lack shells. Because fossils mostly represent the hard parts of organisms, snails are the most common types of gastropod fossils. Slugs are not preserved as fossils.
Why would a shark not be a good index fossil?
A shark would not be a good index fossil because. A shark would not be a good index fossil because the species has survived for too long. A shark would not be a good index fossil because the species has survived for too long.
Are humans good index fossils?
Some fossils are more useful than others in establishing the age of rocks. These are called index fossils. … It is possible that humans also will be good index fossils at some time in the distant future. Humans have distinct hard parts, and we often bury our dead.
What is the most famous fossil?
Lucy, a 3.2 million year old Australopithecus afarensis named after the Beatles’ song “Lucy in the Sky with Diamonds”, is perhaps the most famous fossil in the world.
Which index fossil is the youngest?
youngest to oldest…
- Early Pleistocene 0.5 million.
- Tertiary Period.
- Cretaceous Period 145 to 66 million.
- Jurassic Period.
- Triassic Period.
- Permian Period.
- Pennsylvanian Period.
How old is a pink gastropod?
It could be up to 16 million years old. Amazing earth science resource or fossil gift.
How old is a gastropod fossil?
The oldest gastropod fossils are over 500 million years old. Fossil gastropods come in all shapes and sizes. The molluscs are split into different groups – the gastropods, bivalves and cephalopods.
How old is a trilobite fossil?
Trilobites existed for nearly 270 million years.
Why would a shark be a good index fossil?
The shark cannot be considered as a good indicator for fossil study. Because the species is known to have survived for a very long period of time. … And, therefore, do not corroborate to a specific period of time. Graptolites and Ammonites are considered as the best index fossils.
Are sharks good index fossils?
salt water would degrade the fossil over time. it doesn’t have structures that can be preserved in a fossil. …
What makes an index fossil?
Index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment. A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.
Would trilobites make good index fossils?
Because they evolved rapidly, and moulted like other arthropods, trilobites serve as excellent index fossils, enabling geologists to date the age of the rocks in which they are found.
In what era can the oldest fossil be found?
Paleozoic Era is the era where the oldest fossils can be found. These era is between 544 to 245 mya (million years ago).
How index fossils determine the age of rocks?
To date rocks geologists first give a relative age to a layer of rock at one location. Then they can give the same age to matching layers of rock at other locations. Certain fossils, called index fossils, help geologists match rock to layers.