11.   That might not sound like much, until you put it into a geological time scale of tens or hundreds of millions of years.

12.   The behavior seems to be analogous to the buckling of sheets of rock under pressure over geological time periods.

13.   Their losses are precisely documented, from the minutiae of sole survivors to the patterns of extinctions of birds and their ancient relatives over the eons of geological time.

14.   The process, he said, is part of a natural cycle in which ice shelves grow and then calve icebergs over geological time scales.

15.   This discovery pushes the date for their appearance back to the earliest part of geological time.