I need some help with some questions below. I have looked everywhere in the internet and cant find the information.
Where are ammonites found?
The era or period it lived?
How old is the fossil?
What is looked like?
The habitat it lived in?
Any other interesting information about ammonites.
I have an assignment due tomorrow and I badly need some help. Please someone out there...
i am researching a fossil called the Asteroceras Obtusum. If there is any information on this fossil, it would brilliant.
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As well as the information already revealed in your very similar question on this ammonite, you should be writing the specific name with a small ‘o’ and, if typing, putting it in italics.
As far as I gather, you require information on one particular ammonite, not ammonites in general.
Asteroceras fossils may be found at Lyme Regis in the Asteroceras obtusum zone of Upper Sinemurian age which was 196-190million years ago.
They were free swimming animals that most likely preyed on fish and other animals. They were very common in the seas all around the world.
They looked like this…. http://upload.wikimedia.org/wikipedia/commons/d/d1/Asteroceras_BW.jpg
And their fossils look like this…
http://upload.wikimedia.org/wikipedia/commons/7/7d/Ammonite_Asteroceras.jpg
The first molluscs appeared around 550 million years ago during the early Cambrian period, the period along with most of the basic forms of creature that exist today. Life was exclusively marine at this point and these early molluscs were extremely basic in their construction. The first cephalopods appeared in the late Cambrian and horn shaped shells of these small creatures, such as Plectronoceras, have been found containing basic chambers with a connecting tube called a siphuncle. Although we cannot be exactly sure what these creatures looked like, certain similarities in construction suggest they were the earliest ancestor of all later cephalopods including ammonites, belemnites, squid, octopi and cuttlefish. It seems likely that these early creatures crept along the sea floor possibly taking on a predatory role, though until we find a fossil of the soft parts nobody will really know for sure!
http://www.tonmo.com/science/public/ammonites.php
Asteroceras obtusum is also known as the Obtuse Star Ammonite
http://www.g6csy.net/fossil/bvm.html
Go to this link and you will find photos and some information….
http://dinosaurdenfossilsandtravels.blogspot.com/2009/01/ammonites-in-one-form-or-another-are.html
Good luck
Try wikipwdia for ammonite. try google (better still, google scholar, which is a free download) for the specific species.
Ammonites are found all over were Panthalassa Ocean used to exist.
Ammonites lived from the Silurian clear into the KT event, 65 million years ago.
Fossil age ranges from 400-65 million years old.
Ammonites looked (depending on the species) either like a squid with a shell, or like the modern day nautilus.
Habitat: Open seas.
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