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A previously known, but undocumented small  Grallator  ichnofauna associated with the basal Wingate Sandstone Formation is a typical Late Triassic assemblage. The tracks are very narrow with high length/width ratios, and strong mesaxony (high anterior triangle: length/width ratios). The assemblage reveals at least 88 similar-sized tracks resolved into a minimum of 24 trackways. Trackway pace lengths and speed estimates vary. The tracks occur at least 6.5 metres above the base of the aeolian Wingate Sandstone, but are associated with a thin current rippled surface indicative of a phase of fluvial activity. The trackways show preferred orientations mainly parallel to the direction of current flow indicators, and thus suggest progression along a drainage. The stratigraphic occurrence correlates with other basal Wingate ichnofaunas, at distances up to 240 km to the north, associated with a break in aeolian deposition ~ 7.0 metres above the base of the cliff-forming Wingate Sandstone. Such regional scale correlation of a distinctive track-bearing unit allows for the definition of a ‘basal Wingate megatracksite’.

historical biology

A Late Triassic theropod track assemblages from the basal Wingate Sandstone, western Colorado: implications for regional correlation and the megatracksite concept