Questions tagged [fossils]

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2
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1answer
42 views

What is the time period of these chalk/clay layers?

These limestone-clay rocks are very common in the Alps, they come from weather changes. How many years does it take to make one of the rock bands? 7 years, equivalent to an el-nino type event? 1000 ...
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29 views

Have fossil-containing gastroliths been found inside other fossils?

This article describes gastroliths ("stomach stones"). It says that gastroliths have been found inside the rib cages of fossilized creatures such as dinosaurs. It also says that gastroliths sometimes ...
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2answers
134 views

How was the onset of the Cambrian period dated?

What dating method was used to determine the beginning of the Cambrian, and what was its margin of error? Was only one fossil dated, or were a number of similar fossils used?
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2answers
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Has there ever been a case where we have found what appears to be a prehistoric fossil but have no way of dating it?

I find that when ever I learn of a new fossil, the age of said fossil is always mentioned. This perplexes me given how intuitively rare it seems to have radioactive material to date a formation. I ...
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1answer
74 views

Identification of Iguanodon and Maiasaura

What are some good ways to distinguish between Iguanodon and Maisaura fossils, or even just pictures of the two dinosaurs?
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1answer
66 views

Have fossils ever been found in the asphalt lakes of Trinidad and Venezuela?

La Brea tar pits in California are the result of ancient oil seepages and famous for the fossils of extinct animals which were trapped in the tar. The asphalt lakes in Trinidad and Venezuela are also ...
3
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2answers
190 views

How long ago was the first limestone formed?

It is readily apparent from the fossil record that the first limestone was laid down hundreds of millions of years ago, but how long ago was the very first limestone formed? It could be approximately ...
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0answers
49 views

Continuous production of amber by trees in one location

In which well known amber location did trees produce amber for the longest continuous period of time, roughly how long was it, and was it long enough to see signs of evolution at work in any of the ...
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0answers
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What geographical features facilitate amber fossilization?

Image source: Wikimedia. There seems to be a few places in the world where amber (fossilized tree resin) can be found in large quantities: Amber can be found in many places around the world ...
2
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1answer
78 views

Is there a massive drop in quality of Cretaceous vs. Triassic dinosaur fossils?

One thing that still blows my mind about dinosaurs is the massive timeline. Relevant to this question are the time periods: Triassic Period (252.17 to 201.3 million years ago) Cretaceous Period (145 ...
2
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1answer
51 views

Can hippopotamus fossils be found all along the Nile?

The image below shows their historical range (red) and current range (green) of hippopotamuses: Image source: Six Surprising Facts About Hippos, 2014 Hence my question... Question: Can hippopotamus ...
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4answers
2k views

How long could a steel artifact last?

Would man made steel artifacts be able to be preserved like fossils for millions of years, or would corrosion make it dissipate? What about metals such as aluminum that dont corrode as easily?
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3answers
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What is this (possible) fossil from the triassic/jurassic boundary?

My son recently found this: while walking at Waterloo Bay in Northern Ireland. It looks (to my untrained eye) like it could be a plant fossil. Is this correct? If so, is it possible to tell anything ...
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2answers
82 views

Curious natural patterns on the surface of basalt blocks that make up the sidewalk

During one of my walks through the city streets, I noticed that some basalt blocks that make up the sidewalk have in their surface some very curious natural patterns: The photos above was taken at ...
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2answers
27 views

Is there any significance of lacustrine gastropoda fossils regarding paleoenviroment interpretation?

How to interpret lots of gastropoda fossils seen in lacustrine marls? Do they indicate any paleoenvironment conditions? Depth, temperature, chemistry, ph?
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2answers
75 views

Fossil in Chert pebble picked up on a Kent beach

Please identify the fossil in the picture below. size of pebble is around 40mm diameter and the pebble had been broken to reveal the internal structure.
2
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1answer
154 views

How Good is The Evidence For Snowball Earth?

Some geologists say there were times between 770 million years BP and 630 million years BP when ice ages were so profound that the Arctic and Antarctic ice caps met at the equator. This is called the ...
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1answer
132 views

Can you please help me to identify this thing I found inside a rock in the Almanzora riverbed Spain [closed]

Can someone please help me identify this thing I found inside a rock in the Almanzora riverbed Spain
0
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1answer
128 views

What exactly is ammonite?

I miss the definition of ammonite. In my opinion, many authors confuse the term "Ammonite" and "Ammonoid". Ammonoids (Ammonoidea) are large group of cephalopods including for example goniatites (...
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1answer
212 views

Can someone please help me identify what this is… stromatolite…coral…or neither…help [closed]

Hi I'm trying find out what kind of rock this is.... I have a chunk the size of akeg of beer looks like muddy coral on the bottom and coral like inside and agatized sponge or coral or something else ...
3
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1answer
128 views

Donation Options for Fossil and Mineral Collection

The father of a friend of mine passed away recently. He left behind an extensive collection of fossils and minerals. They include a saber tooth tiger skull, mastodon tooth, shark teeth, tons of ...
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1answer
111 views

I need help with these geode like rocks [closed]

I found these rocks in my pasture and was excited because I thought I had found some geodes. The rocks were in a sandy bank and looked like eggs sticking out of the bank. I am located in Ness County ...
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2answers
106 views

What is this stratefied limestone sphere?

What is this stone from the alps of provence? It's two spheres, one of them is made of at least 25 layers.
5
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1answer
180 views

Geological feature - what is it?

Hello, We were walking in Bundoran in Donegal County, Ireland today and we encountered the geological feature shown in the picture (from above from cliffs and from very close up at beach level). We ...
3
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1answer
204 views

Fossil from North Norfolk coast, UK

This palm-sized rock is from the beach at Eccles-on-Sea (North Sea coastline). I can see four types of material: A brown, slightly translucent, 6cm tubular fossil(?) that I can mark with a steel ...
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2answers
133 views

What is this strange fossil I found?

I found this weird fossil rock and I am wondering if anybody could help identify what could have made the imprint in it or what kind of rock it is?
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1answer
329 views

What is the oldest fossil on Earth?

What is the oldest fossil ever found on Earth? Where and when was it found? What was the oldest fossil with a brain with 2 hemispheres ever found?
2
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1answer
300 views

How quickly can coral fossilize?

On a trip to Honduras a few years ago I visited one of the islands off its north coast with a friend and went to a section of it mostly with nothing but residences which looked far less visited by ...
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70 views

Rock / Fossil ID? [closed]

Please see link below if anyone can help ID. I think the little claw looking thing is a fossil? The red rock is smooth,Matt in some places and semi glossy on some of the sides. The black rock has ...
2
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1answer
175 views

What kind of tooth is this?

Please help me identify this tooth and the era its from. I found it in Panama City Beach Florida. Its cold and hard when i bite it. It looks very old. Possibly a shark tooth?
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1answer
1k views

Why don't animals rot when trapped in amber? [closed]

I just saw an image of a gecko stuck in amber 58 million years ago. Why don't animals rot when they are trapped in amber? I've seen dry insects whose chitin shells persist for a long time away from ...
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2answers
279 views

ID on a potential flint fossil

I was out in Swinley Forest in Bracknell(United Kingdom) last weekend. The area is a large pine forest but the ground is full of flint and is very sandy. I stumbled across a piece of flint and ...
5
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1answer
114 views

Why the $\delta \, ^{18}\text{O}$ in foraminifera shells decrease with temperature even if the oceanic $\delta \, ^{18}\text{O}$ stay constant?

I understand why foram shells contain more $^{18}\text{O}$ when there are ice sheets present, since $^{16}\text{O}$ evaporates more readily and gets trapped in the ice, increasing the relative ...
3
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1answer
128 views

What type of mammal does this fossil tooth belong to?

The fossil tooth was found western South Dakota in the early 1980s. I can't be sure on the location. It might have been collected from Belle Reservoir, near Belle Fourche, Butte County, South Dakota, ...
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4answers
7k views

Why are many fossils found in deserts?

Why are deserts famous for fossils? Is it a coincidence? Some examples: Giant Catfish Fossil Found in Egyptian Desert Chile's stunning fossil whale graveyard explained Giant Dinosaur Fossil Found ...
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1answer
362 views

What are Ordovican trace fossils, and what do they look like?

There are some unusual structures in recent images from the Mars Curiosity Rover's MAHLI (Mars Hand Lens Imager) shown in the Space.com article Curiosity Rover Spots Weird Tube-Like Structures on Mars....
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5answers
851 views

Why does mineral oil occur below natural gas?

Why does mineral oil occur below natural gas? It was asked in our science book in the Geology section and I didn't get a clear explanation from the teacher.
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2answers
763 views

What is Oligo-Miocene radiation?

Some studies about Earth's fosilized plants/animals mention a "Oligo-Miocene radiation". Examples: Our study therefore strengthens previous suggestions that the absence of very large penguins ...
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1answer
226 views

What type of fossil is this found at northern Ohio?

I need some help identifying this fossil. I found the rock 30 years ago along the Cuyahoga River in northern Ohio. Northern Ohio is glaciated so it is possible that the specimen was transported to ...
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0answers
83 views

Is this a fossil or a mark on the stone

Found this rock during a walk along the coast and I can't tell weather the white line is a fossil or just a mark on the rock. Any help in identifing weather this is a fossil or not would be ...
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1answer
110 views

Who can it belong to? fossil tooth

**Tooth was found in Baltic Sea, near Lithuanian coast, **
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2answers
170 views

Is this a fossil we found in a store? [closed]

We found this rock at a mineral and jewelry store. The gal wrote down what it was and we cannot find what we think she wrote on the internet anywhere. She wrote Mcstrodlite.
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0answers
362 views

Are fossils in slate 3 dimensional or does the slate split open at the weakest point where the flat imprint of the fossil is found?

In this picture you see a fossil of an Ammonite. When you break a slate with a hammer it will fall apart so sometimes you can find a fossil. But is this fossil only there in the slate just at the ...
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1answer
75 views

What are some regions where land-living island animals have left fossil records within the sea, of the coast of the island?

What are some examples of fossil sites where land-living fossils end up in the sea, off the coast-line of an island?
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2answers
446 views

Aligator or Dinosaur Fossil skin type rock

The more I looked at this stone and touched it, the more this thing looked like it was wrapped in some kind of reptile skin. It may just be a random rock. More photos if needed. Does this look like ...
4
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2answers
202 views

“Impression and pseudomorphism” in fossils

In a book on invertebrate paleontology I have (Treatise on Invertebrate Palaeontology, A) there is a diagram showing possible fates of a shell after the death of the organism. One of the possible ...
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1answer
176 views

What are these lines on this stone?

I found this on Lake Ontario in Canada. I was wondering is there is anything special/out of the ordinary about it?
4
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1answer
262 views

A sedimentary rock with only minerals

In my text book I came across this multiple-choice question A sedimentary rock consists of only minerals and lacks fossils, it could be classified as: i) a clastic sedimentary rock ii) a chemical ...
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2answers
241 views

Fossil or Pseudofossil?

I found these rocks in the Oregon Coast Range many years ago and have always wondered whether the interesting image was a pseudofossil or an actual fossil. If it's a pseudofossil, any ideas on how it ...
5
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1answer
437 views

Circular patterns at bottom of rock, is it a fossil?

The image below was taken on a hike. Circular patterns at bottom (it is flatter on this face and round otherwise) appear either man-made or possibly it is a fossil. Any idea what this could be?