Ichnotaxa are names used to identify and distinguish morphologically distinctive ichnofossils, more commonly known as trace fossils. They are assigned genus and species ranks by ichnologists, much like organisms in Linnaean taxonomy. These are known as ichnogenera and ichnospecies, respectively. Ichnotaxon - Wikipedia https://en.wikipedia.org/wiki/Ichnotaxon
Noun. morphotype (plural morphotypes) (biology) Any of a group of different types of individuals of the same species in a population; a morph. [ morphotype - Wiktionary https://en.wiktionary.org/wiki/morphotype

The Broome Sandstone of the Dampier Peninsula provides almost the entire fossil record of dinosaurs from the western half of the Australian continent. To date, intensive research on the dinosaur tracks has focused on the Walmadany area (James Price Point), 50 km north of Broome.

This stretch of the National Heritage listed Dinosaur Coast is now known to preserve the world’s most diverse dinosaur track fauna, with an incredible 21 different types of tracks made by theropod, sauropod, ornithopod and thyreophoran dinosaurs.

The 4 types of dinosaur found on the Dinosaur Coast
The 4 types of dinosaur found on the Dinosaur Coast
Dinosaur size categories based on approximate hip height
Figure 66B: Size categories based on approximate hip height.
Dinosaur sizes vary considerably, depending on the type.

Calculations based on track size and distance apart suggest the largest sauropods were more than 5m high at the hip.

Eleven of the track types found in the Walmadany area can formally be assigned or compared to existing or new ichnotaxa.

The remaining 10 represent morphotypes that, although distinct, are currently too poorly represented to confidently assign to existing or new ichnotaxa. There are also a number of indeterminate tracks that may be assignable to new or existing track types in the future.

No vertebrate body fossils are known from the Broome Sandstone.

FACT FILE ON THE TRACKS OF THE DINOSAUR COAST

Three-toed, medium-sized bipedal carnivorous predatory dinosaurs.

Hip heights of 1.3 – 2m and estimated lengths of 3.5 – 7m.

5 types of tracks identified, comprising four large-bodied forms and one medium-bodied form.

Megalosauropus broomensis, which means ‘Big lizard-foot of Broome’ is one of the large-bodied forms, first described in the 1960s.

Check out more theropod images.

Massive, long-necked quadrupedal herbivores.

Hip heights of 2 – 5.5m and lengths of 10.5 – 28m.

At least 6 types of tracks found. The tracks of sauropods are far and away the most abundant tracks throughout the study area, suggesting a diverse (and potentially populous) sauropod fauna.

Check out more sauropod images.

Small to medium-sized bipedal herbivores such as Iguanodon, Leaellynasaura and Muttaburrasaurus.

Hip heights of 0.5 – 2.5m and estimated lengths of 2 – 12m.

4 types of tracks found made by a small-bodied, a medium-bodied, a large-bodied and a very large-bodied form.

Check out more ornithopod images.

Medium-sized, armoured quadrupedal herbivores covered in plates and spikes, with names such as Ankylosaurus, Stegosaurus and Kunbarrasaurus.

Hip heights of 0.7 – 3m and estimated lengths of 3.5 – 8.5m

6 types of tracks found, made by three medium-bodied forms, one large-bodied form and two very large-bodied forms.

Check out more thyreophoran images.

For more information on each dinosaur group, click the button below.

Link to Publication
“The dinosaurian ichnofauna of the Lower Cretaceous (Valanginian–Barremian) Broome Sandstone of the Walmadany area (James Price Point), Dampier Peninsula, Western Australia.”