Word: stratum
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Dates: during 1960-1969
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From ground level to about 16 feet down, the earth beneath the Abri Pataud is a series of thin layers, like a plank of plywood. Each layer, or stratum, is half-an-inch or so thick. Many of these strata constitute "occupation layers": buried within each are flint and bone objects that accumulated as the layer slowly accumulated during geological history. Some of the layers represent a year's occupation of the Abri Pataud; others contain the relics of 10, 20 or more years. A few yield no bones or man-made objects for they were laid down while...
...unconscious as sexual energy or libido; Alfred Adler made it the drive for power to overcome inferiority feelings. In his "analytical psychology," Jung divided the unconscious into two layers. Within one, relatively superficial, he gave libido and the power drive less ambitious roles. In the second and far deeper stratum, he perceived the force of the primeval, collective unconscious of the human race...
...huge molars that suggested that he lived on nuts and tough vegetation. Leakey put the Nutcracker man's age at 600,000 years. He holds that the bones of his latest find-the child and adult-are older still because they were buried in a lower stratum of the Olduvai Gorge...