Robuta

https://www.mapress.com/zt/article/view/zootaxa.4860.4.2
late triassicrevisionqueensland
https://www.usgs.gov/publications/element-cycling-middle-late-triassic-shublik-formation-mineralization-vs-recycling
The Triassic Shublik Formation in northern Alaska is one of the major source rocks in North America, having generated much of the petroleum in Prudhoe Bay and...
late triassicshublik formationelementcyclingmiddle