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It is the most common dinosaur found in the Egg Mountain locality. [35] Orodromeus [16] O. makelai [16] "Choteau/Bynum" Lacustrine Interval, Lower Flag Butte Member [5] An orodromine thescelosaur which was the most common small herbivore in the Egg Mountain area. [36] [37] Prosaurolophus [16] P. maximus [16] Landslide Butte; Two Medicine River
Mountain formation occurs due to a variety of geological processes associated with large-scale movements of the Earth's crust (tectonic plates). [1] Folding , faulting , volcanic activity , igneous intrusion and metamorphism can all be parts of the orogenic process of mountain building. [ 2 ]
In adult females, the abdomen is widened towards the middle and significantly increased due to the large numbers of eggs produced. Their abdomen ends in a pointed secondary ovipositor that surrounds the actual ovipositor. This is ventral formed from the eighth abdominal sternite, which is named subgenital plate, [7] or also called operculum.
The type species, Orodromeus makelai, was named and shortly described by Jack Horner and David B. Weishampel in 1988. The generic name is derived from Greek ὄρος, oros , "mountain", in reference to the Egg Mountain site, and δρομεύς, dromeus , "runner", referring to the cursorial habits of the animal.
In the form of a dove upon the waves, she lays the Cosmic Egg and bids Ophion to incubate it by coiling seven times around until it splits in two and hatches "all things that exist... sun, moon, planets, stars, the earth with its mountains and rivers, its trees, herbs, and living creatures". [19] [20]
The generic name refers to Marion Brandvold's discovery in 1978 of a nest with remains of eggshells and babies too large to be hatchlings. These discoveries led to others, and the area became known as "Egg Mountain", in rocks of the Two Medicine Formation near Choteau in western Montana. This was the first proof of giant dinosaurs raising and ...
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The documentary Walking with Dinosaurs portrayed a mother Diplodocus using an ovipositor to lay eggs, but it was pure speculation on the part of the documentary author. [30] For Diplodocus and other sauropods, the size of clutches and individual eggs were surprisingly small for such large animals. This appears to have been an adaptation to ...