Did You Know? 15 Incredible Ammosaurus Facts


The Ammosaurus or Ammosaurus solus is a type of genus of sauropodomorph type that was found in the North American continent. In 1889, paleontologist Marsh O.C. named the specific species Ammosaurus major in the American Journal of Science.

The first fossils were found in the Portland Formation of the Super Newark in Connecticut. Later fossils were also found in the Navajo sandstone areas in Arizona as well as eastern Nova Scotia in Canada. The fossils have been assumed to be a part of the Bajocian districts in the region.

The fossils were first found during the construction of the South Manchester bridge, which necessitated the use of sandstone quarry. Later on, more fossils were found in 1969 by a team led by John Ostrom when that same bridge was broken down.

In fact, this dinosaur gets its unique name because of the fact that it was found in sandstone deposits. The Ammosaurus major is considered by many to be the smallest known sauropod dinosaur due to its size being comparatively smaller than other dinosaurs.

Keep on reading for more amazing facts about the Ammosaurus!

Ammosaurus Interesting Facts

How do you pronounce 'Ammosaurus'?

It will become easier to pronounce the word Ammosaurus if it is broken down into smaller parts like - 'Am-mo-sau-rus'.

What type of dinosaur was an Ammosaurus?

The Ammosaurus is a genus of a dinosaur that belongs to the Sauropodomorph type.

In which geological period did the Ammosaurus roam the earth?

The genus Ammosaurus dinosaurs roamed the earth during the Early Jurassic and Middle Jurassic geological periods.

When did the Ammosaurus become extinct?

After the end of the Early Jurassic Period, the Middle Jurassic Period lasted till around 180 million years ago, so it can be guessed that these dinosaurs also went extinct around the same time.

Where did an Ammosaurus live?

Most Ammosaurus fossils and some other fossils that have been attributed to the genus Ammosaurus have been found in the present-day North America continent. So far, fossils of this genus have been found in the US state of Connecticut, primarily along with the state of Arizona. Some fossils have also been found in Nova Scotia in Canada in the McCoy Brook Formation.

What was an Ammosaurus's habitat?

The Ammosaurus fossils were initially found in a sandstone quarry in the state of Connecticut. Scientists concluded that the area saw wet and dry seasons. Later, fossils were also discovered in Arizona and Nova Scotia in the McCoy Brook Formation.

Who did an Ammosaurus live with?

It is difficult to ascertain if the Ammosaurus major lived alone or moved in groups. However, based on the fact that quite a few fossil specimens were found in the state of Connecticut, it may be assumed that these dinosaurs of different ages lived together in groups during the Early Jurassic and Middle Jurassic Period.

How long did an Ammosaurus live?

Due to incomplete data, paleontologists have not been able to figure out the exact lifespan of an Ammosaurus. that roamed the earth during the Early Jurassic and Middle Jurassic periods.

How did they reproduce?

This genus of dinosaurs reproduced in the usual way as the female would lay eggs after the process of fertilization was complete.

Ammosaurus Fun Facts

What did an Ammosaurus look like?

Based on artistic recreations of the dinosaur from the Early Jurassic and Middle Jurassic periods, scientists have been able to figure out that this was a bipedal dinosaur with strong but slender legs. Ammosaurus solus also had a long, sloped neck and quite long hands. It also had a thick tail which tapered off near the end. The body of this dinosaur is thin at the top but bloats towards the end.

Kids who want to become paleontologists should know Ammosaurus Facts.

How many bones did an Ammosaurus have?

Quite a few fossil specimens of this dinosaur genus have been found from three different locations in Connecticut, Arizona, and Nova Scotia. However, the fossils or bone holotypes are not complete to the extent that they can present a lot of information about the dinosaur. The skull of this dinosaur has not been found even though partial remains of both adult and juvenile dinosaurs have been found.

Paleontologists concurred that the sandstone block, which had the front portion of the skull, was already used in making the bridge. After the bridge was broken down, the team by John Ostrom found some more fossils. All the fossils that have been found from different locations were determined to have belonged to dinosaurs of different ages.

How did they communicate?

Due to a lack of information, paleontologists have not been able to figure out how these dinosaurs communicated with each other.

How big was an Ammosaurus?

After a thorough study of the fossils found of this genus, paleontologists have estimated the size of this dinosaur to be 13 ft (4 m). This makes the Ammosaurus dinosaur roughly half the size of a Duriavenator that is 23 ft (7 m) in size.

How fast could an Ammosaurus move?

Scientists have not really been able to figure out how fast the Ammosaurus could have moved.

How much did an Ammosaurus weigh?

Based on the fossil records, paleontologists have calculated the weight of this Ammosaurus dinosaur to be approximately 154 lb (70 kg).

What were the male and female names of the species?

There are no separate names for the male and female dinosaurs of this species. Hence, they are commonly referred to as a male or female Ammosaurus dinosaurs.

Did you know that there are no foolproof methods to determine the differences between male and female dinosaurs just from their fossils? Even though there exist many processes, the problem still persists!

What would you call a baby Ammosaurus?

A baby Ammosaurus does not have a unique name to refer to it. So it is usually referred to as a hatchling or nestling following standard terminology.

What did they eat?

There are disagreements regarding the eating behavior of this dinosaur. While most scientists believe they were herbivorous in nature, some scientists believe that they actually might be omnivorous based on the study of the gut of the fossils.

How aggressive were they?

It can be assumed that the dinosaurs were not too aggressive since they were herbivorous in nature and did not have to hunt for their food. There haven't been many instances of herbivorous dinosaurs being very aggressive with other species.

Did you know...

The Ammosaurus and Anchisaurus are often considered to be quite close relatives. Major Marsh O.C. initially categorized the Ammosaurus as a species of Anchisaurus, keeping both Ammosaurus and Anchisaurus in the same group in the American Journal of Science.

However, Major Marsh later removed the Ammosaurus and created a separate genus. Some recent studies argue that the Ammosaurus is actually a species of Anchisaurus named Anchisaurus Polyzelus. However, there has not yet been enough credible data to prove if the Anchisaurus Polyzelus is the advanced type of an Ammosaurus.

What is the fastest dinosaur?

Paleontologists believe that the Ornithomimids were the fastest dinosaur with a speed as high as 25 mph (40 kph). This dinosaur had a shape and structure similar to that of an ostrich. The ornithomimid was a family of theropod dinosaurs. They roamed the earth during the Late Cretaceous period.

What does Ammosaurus mean?

The word Ammosaurus refers to the nature of the dinosaur and the place where it was originally found. The Greek word 'Ammos' refers to sand or sand-filled ground, and 'saurus' refers to the lizard in order to denote a dinosaur. Therefore, the name loosely translates to a sand lizard. Since the fossils of this genus were found in a sandstone quarry, paleontologists named it after the physical feature of the place where it was found in.

We've been unable to source an image of Ammosaurus and have used an image of Unaysaurus instead. If you are able to provide us with a royalty-free image of Ammosaurus, we would be happy to credit you. Please contact us at [email protected].

We've been unable to source an image of Ammosaurus and have used an image of Plateosaurus instead. If you are able to provide us with a royalty-free image of Ammosaurus, we would be happy to credit you. Please contact us at [email protected].

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