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The Tyrannosaurus Rex, Velociraptor and Triceratops were all from the Cretaceous period, not from the Jurassic period.

I'm guessing the name Jurassic "sounded" better than Cretaceous, hence the preferred name.

In the Jurassic Park franchise, which dinosaurs on the island were actually from the Jurassic period? Were there any?

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Are you asking about the films, the books, or both? – Hypnosifl Jan 19 at 19:38
    
@Hypnosifl To be honest, I didn't consider the books when I was thinking about this. – LarsTech Jan 19 at 19:44
    
Which films are you asking about? or are you asking about the whole franchise? – RedCaio Jan 19 at 23:02
    
@RedCaio The franchise, which is why I included the two tags available. – LarsTech Jan 19 at 23:05
up vote 12 down vote accepted

Here is a wikipedia page about the dinosaurs (and other prehistoric creatures) shown in the Jurassic Park movies (it also lists the ones mentioned in the books, but I take it from the comments you were just interested in the movies). The ones that actually lived in the Jurassic are:

Stegosaurus--appeared in films 2, 3, and 4.

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Brachiosaurus--appeared in 1 and 3.

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Dilophosaurus--appeared in 1.

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Compsognathus--appeared in 2 and 3.

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Apatosaurus--appeared in 4.

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Dimorphodon--a pterosaur rather than a dinosaur, but it appeared in 4.

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Ceratosaurus--appeared in 3.

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Mamenchisaurus--appeared in 2.

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Also, Metriacanthosaurus and Proceratosaurus did not appear in any movies, but their names appeared next to vials in cold storage in 1, and the name Metriacanthosaurus also appeared in a brochure in 4. Likewise, in 1 the name Segisaurus appeared on a map of Isla Nublar, though they weren't seen in the movie.

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According to this site's listing of dinos from the Jurassic period http://www.prehistory.com/timeline/jurassic.htm

Brachiosaurus (Jurassic Park)

Stegosaurus (Jurassic Park III / Jurassic World)

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There was also another type of sauropod different from Brachiosaurus (the front legs were shorter than the back, unlike Brachiosaurus) in The Lost World, this page identifies it as Mamenchisaurus which was from the Jurassic. Also, The Lost World featured the small dinosaur Compsognathus which was from the Jurassic. And Stegosaurus was also featured in The Lost World (Jurassic Park II). – Hypnosifl Jan 19 at 19:32
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"Compys" were also in the original book - they may have been shortly seen or referenced at one point in the original film but certainly not to the degree they were in the book – NKCampbell Jan 19 at 19:34
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Yes, and if the question covers the books as well as the films, then a lot of the sauropods mentioned as being in the Sauropod paddock would probably have been from the Jurassic if we looked them all up. – Hypnosifl Jan 19 at 19:36
    
Thought of one more: the inaccurately-portrayed Dilophosaurus was in reality from the early Jurassic. – Hypnosifl Jan 19 at 19:38
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"they may have been shortly seen or referenced at one point in the original film" -- The Compys weren't featured at all in the original film, but they did have a couple of prominent scenes in The Lost World (the second film). My comments above about Mamenchisaurus and Stegosaurus were also about the film titled The Lost World, not the book. – Hypnosifl Jan 19 at 21:19

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