Just Above the Iridium Layer

Interesting! I wonder exactly how long after the Ir layer these were deposited. Ie. were these the last of them, the die-off that immediately resulted from the 'nuclear winter', or did they survive, say, a few thousand years after the fact. The question recently came up for me after I read a paper on my local Upper Cretaceous... another paper that was referenced indicated that Baculites survived into the early Danian. Apparently it's still a contentious issue...