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The Dinosaurs and Prehistoric Animals of Maryland

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Maryland is a fairly small state, but some very big dinosaurs and prehistoric animals have been discovered there, as listed below. (See an interactive map of dinosaurs and prehistoric animals in the United States.)

1. Astrodon

astrodon
Dmitri Bogdanov

The official state dinosaur of Maryland, Astrodon was a 50-foot-long, 20-ton sauropod that may or may not have been the same creature as Pleurocoelus (below). In any event, the importance of Astrodon is more historical than paleontological; two of its teeth were dug up in Maryland in 1859, the first dinosaur ever to be discovered in this small state.

2. Cetotherium

cetotherium
Nobu Tamura

For all intents and purposes, Cetotherium can be considered a smaller, sleeker version of the modern gray whale, about one-third the length of its famous descendant. The odd thing about Maryland's Cetotherium specimen is that the fossils of this prehistoric whale have been most often found off the shores of Eurasia, not the Atlantic coast!

3. Ecphora

ecphora
Wikimedia Commons

Maryland's official state fossil, Ecphora was a large, predatory sea snail of the Miocene epoch. If the phrase "predatory snail" strikes you as funny, don't laugh: Ecphora was equipped with a long, toothed "radula" that it used to bore into the shells of other snails and mollusks and suck out the tasty guts nestled inside.

4. Pleurocoelus

pleurocoelus
Fort Worth Museum of Natural History

Oddly enough, Pleurocoelus is the official state dinosaur of Texas, which no one would consider close to Maryland. As mentioned above, this sauropod may or may not have been the same animal as Maryland's official dinosaur, Astrodon, and in any case Texans have been lobbying to change their state dinosaur to something more home-grown.

5. Propanoplosaurus

propanoplosaurus
R. Stanford
The recent discovery of Propanoplosaurus, in Maryland's Patuxent Formation, is important for two reasons. Not only is this the first undisputed nodosaur (a type of ankylosaur) to be discovered on the eastern seaboard, but it's also the first-ever dinosaur hatchling to be identified in this region, measuring only about a foot from head to tail.
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