The approximately 2700 footprints of different types of dinosaurs are in one of the Obernkirchen sandstone quarries. They were discovered in 2007 and 2008 and exposed by paleontologists from the Lower Saxony State Museum in Hanover. The traces were found within the 6 to 9 meter thick Obernkirchen sandstone, which lies under younger surface layers here.
The trace fossils are attributed to the Berriasian (Lower Cretaceous, about 145.5 to 140.2 million years ago) and lie in two horizons. In the lower horizon there are mainly traces of smaller theropods, which are often referred to as "raptors" in the media. In the upper horizon, traces of animals from different ages that resemble Iguanodontipus and cf. Caririchnium dominate. The fact that the traces were so well preserved is due to the fact that the fresh prints were quickly superimposed by storm sands.
Source: Wikipedia