They include structures, large spans, portals, extreme shallow-buried depths, imprints, drainages, inclined ceiling, inclined sidewalls, slender rock pillars, rock staircases, site and strata selections, caving lighting, carving method, and underground construction surveying.
Seaside towns are built on strata upon strata of happy memories; a sort of emotional geology.
"Marseille created itself, strata upon strata, with foreign populations," said the city's longtime mayor, Jean-Claude Gaudin. Jean-Claude Gaudin
The unweathered lithology includes black highly fractured (fissile) carbon-rich strata, gray mildly fractured thinly layered (laminated) strata, and light-gray weakly fractured massive strata.
Thus rock strata C1 C5−1 is rock strata without deformation pressure.
The strata separation appears in the overburden strata of roof.
Secondary strata Ethnicity, gender Primary strata Age Secondary strata.
This perspective generalizes the traditional perspective of strata, where patients are exchangeable within strata, and independent across strata.
The most spectacular is "Strata" (1983), a big, gridded work done in the highly labor-intensive technique of mezzotint, whose inked plate is a rich black surface that must be scraped or burnished where lighter tones are required.
(The $180 Strata model is plastickier).
