Old black and white dino movie

[L.P.]

Ok. I cannot remember the name of a movie I saw when I was little. It started out in Antarctica and this dino thing was frozen in the ice. Somehow or other it was able to defrost and become alive, and it attacked a light house. I can't remember a lot of it but in the end I think they killed it on a wooden roller coaster with some bio thing. I want to say it started with a number like 10000 but I may be wrong. :) please help!!!

[Andrew]

"The Beast from 20,000 Fathoms!"

http://www.badmovies.org/capsules/b/beastfathoms/

[L.P.]

That's it!!! Thank you so much!