Somewhere along the way, Mr. Margules had not only discovered a new career path, but also a whole new stratum of society.

The Calapooya Mountains are composed of volcanic rocks and newer sedimentary strata.

The later periods are nothing more than these same formations combined in various ways, with now and then the addition of new strata.

They're from the new stratum that was first unearthed about twenty years ago.

After the first such incident, when they were nearly swept away, Scobie always drove his geologist's hammer into each new stratum.

Never before had he seen a couple dressed like these; he had struck a new stratum.

Compounding their problems was the swift rise of an altogether new stratum of Japanese society, the merchant class.

But who can tell what effect this mile or two of new sedimentary strata would have from mere gravity on the level of the supporting surface?

It has not reduced carbon emissions at all, yet it has created a whole new stratum of bureaucracy, administration and expense for industry.

The region became ruled once again by local leaders, or mirs, and a new stratum of young radical Shiʿi commanders.