Maiasaura fossil map
Where fossils of Maiasaura have been found, shown on the Earth as it looked about 75 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 75 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Iguanodonts & duck-bills |
|---|---|
| Lived | 83.6–72.2 million years ago (Campanian) |
| Periods | Cretaceous |
| Family | Hadrosauridae |
| Named by | Horner and Makela 1979 |
| Fossil records | 7 occurrences at 6 locations (PBDB) |
| Found in | United States |
| Rock formations | Two Medicine |
About Maiasaura
Maiasaura (from Greek: μαῖα, lit. 'good mother' and Greek: σαύρα, the feminine form of saurus, lit. 'lizard') is a large herbivorous saurolophine hadrosaurid ("duck-billed") dinosaur genus that lived in the area currently covered by the state of Montana and the Canadian province of Alberta, in the Upper Cretaceous (mid to late Campanian), from 86.3 to 70.6 million years ago.
Text in “About” is quoted from the Wikipedia article Maiasaura (revision 1379507349), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 22 October 2026. Ages are those of the rock layers the fossils were found in.
