Geologic or Deep Time Was Originally Described Using

Dual dating is the practice in historical materials to indicate some dates with what appears to be duplicate or excessive digits sometimes separated by a hyphen a slash or are placed one above the other. For example in 1021 February 175051 the dual day of the month is due to the.

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The Challenger Deep consists of three basins each 6 to 10 km 37 to 62 mi long 2 km 12 mi wide and over 10850 m 35597 ft in depth oriented in echelon from west to east separated.

. The need for dual dating arose from the transition from an older calendar to a newer one. The Challenger Deep is a relatively small slot-shaped depression in the bottom of a considerably larger crescent-shaped oceanic trench which itself is an unusually deep feature in the ocean floor.

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