Extraterrestrisk och terrestrisk kromrik spinell i fanerozoiska kondenserade sediment
… early Paleocene sequence in Zumaia where limestone- and marly layers form a cyclical pattern. This part of the sequence is dated to about 61 Ma. From Garde in Jamtland 22,8 kilogram of middle Ordovician limestone was sampled. This limestone is about 4 million years younger than …