Lapurr Sandstone
The strata date back to the Late Cretaceous , likely Campanian to Maastrichtian , based on palynology and the presence of dyrosaurs and mosasaurs , the upper part of the unit likely extends into the Palaeogene , based on zircon dating . 
<triplet> Late Cretaceous <subj> Campanian <obj> has part <subj> Maastrichtian <obj> has part <triplet> Campanian <subj> Late Cretaceous <obj> part of <subj> Maastrichtian <obj> followed by <triplet> Maastrichtian <subj> Late Cretaceous <obj> part of