diachronous

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diachronous

[dī′ak·rə·nəs]
(geology)
Of a rock unit, varying in age in different areas or cutting across time planes or biostratigraphic zones. Also known as time-transgressive.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Jean Piaget observes how these norms are concerned with permanent "structures", which consequently give the appearance of synchronism as an expression of an invariant diachronism. History is not thus abolished, this is not the author's aim; nevertheless, where it introduces changes it is again a matter of "structures," and diachronic ones at that.
His assignment of this age to the clastic sequence, although somewhat tentative, had important regional ramifications regarding diachronism of basal Silurian sections in southern New Brunswick.