Haubold 1983 described Isochirotherium tracks (Fig. 1) from the Early Triassic Bundsandstein Formation as “thecodonts with partial affinities to dinosaurs or crocodiles.”
Isochirotherium tracks have sub equal digits 2 and 3. The only reptiles with such a pes are derived erythrosuchids. If digit 3 is longer than 2 (X’d out in figure 1), then the track is more likely a rauisuchid or a more derived taxon. Shansisuchus and Erythrosuchus have a pes matching Isochirotherium. Primitive Garjainia does not. It has a longer pedal digit 4, like Proterosuchus and, to a less extent, Ornithosuchus.
Haubold H 1983. Archosaur evidence in the Buntsandstein (Lower Triassic). Second Symposium on Mesozoic Terrestrial Ecosystems, Jadwisin 1981. Acta Palaeontologica Polonica 28 (1-2):123-132.