Copy of *Positive & Negative Fossil Dinosaur Footprint Slabs
Age: 205-200 Million Years Old (Early Jurassic) Location: Connecticut River Valley, Massachusetts Ichnogenus: l Eubrontes Species: Theropod dinosaur species, possibly juvenile Dilophosaurus or similar Slab Size: 17” x 9” x 2”
Track size: 7” x 5”
These are two sedimentary layers with the same footprint. This process of fossilization occurs when a trace is made, quickly hardens, and is buried swiftly with fresh sedimentary deposits that harden within the true impression. Occasional when you split the rocks of this region, you can get both the positive and negative impressions. However in some cases, like this, only one side of the fossil impression survives.
The footprints were discovered, amongst others, by a farm boy, Pliny Moody. E.B. Hitchcock, a clergyman, described the Grallator footprints and others as evidence of ancient birds.