RE:Good morningDfly, They drilled into the Coniacian. First appearance of Cremnoceramus marks the lower boundary of the Coniacian from what I've read.
From Wikipedia: Cremnoceramus is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Turonian to the Maastrichtian of the Late Cretaceous.
But these Cremnoceramus bivalves evolved over time. How they changed tells geologists when the rock was deposited. Them and the ammonites that you have mentioned before. So now I guess they get into the highly detailed analysis of cuttings samples, cores, logs and seismic together with what they learned at Jaguar and Eagle to build a geological model of where the traps are.
This could take a while to figure out. No doubt they have the best paleontogists around determining rock ages and correlating with other info. I'm just wondering how long all of this analysis takes.