Fossils are the remains or prints of old organisms preserved in sedimentary rocks. The fossils of extinct or primitive marine creatures are found in the Northern Highlands. Dinosaur and plant fossils were recently discovered in the Eastern Desert. The oldest mammal fossil found in Jordan belongs to a prehistoric whale with legs (before whales evolved into sea mammals). It was found in Wadi Dahek, where shark teeth can also be found embedded in rocks.
Fossils are common in the limestone mountains of western Jordan. An example of a fossil crop is down in the valley of Wadi al-Seer, at the GPS coordinates: 31.8831°, 35.7549°. Another small fossil patch is on the Desert Highway, south of Qatranah, at the GPS coordinates: 30.9991°, 36.0105°. Wadi Dahek is southeast of Azraq, around the GPS coordinates: 31.5717°, 37.1217°.