Darwin and the Mysterious Mr. X by Loren Eiseley

By Loren Eiseley

VERY-GOOD HARDBACK IN DUSTJACKET THAT was once excellent yet backside 2 INCHES OF entrance bought CRUMPLED UP AND TORN ON facets (MENDED yet nonetheless no longer nice LOOKING).

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W. A. Shinn (reported in Loreau & Purser, 1973, p. 289) observed subaqueous gypsum in the Khor Odaid on the eastern coast of Qatar. C. Kendall, pers. comm. 2006). In contrast, primary subaqueous precipitation of gypsum has not been observed anywhere in Abu Dhabi, except in large brine-filled artificial shot holes left by seismic crews when it forms encrustations of beautiful selenite twins on the surrounding walls. Elsewhere, Gunatilaka & Shearman (1988) described gypsum laminites (balatino type) and gypsum-carbonate/organic couplets from shallow ephemeral pools on the sabkha of Kuwait.

McQueen of the V. C. Illing Partnership, London), led to a great deal of interest in the Arabian Gulf. The dolomite was found associated with gypsum in the carbonate sediments occurring between normal diurnal tidal and spring tidal levels (Wells, 1962). It was not clear whether the dolomite was primary or replacive. This was soon followed by the discovery of a similar occurrence in the sabkha sediments in Abu Dhabi (Curtis et al. 1963). These latter authors noted also that the dolomite was a calcium-rich type; it was associated with anhydrite and gypsum and appeared to be replacive.

1980) and Kenig et al. 29 (1989), although these were missed by Evans et al. (1969), probably due to the crudeness of their drilling techniques. However, there is no transgressive anhydrite in the Kuwait sabkhas (Gunatilaka, pers comm. 2006). The transgressive anhydrite is thus the arid zone equivalent of the transgressive peat that underlies transgressive lagoonal deposits in more humid areas (Evans, 1970). However, it appears to differ from the latter as it is only found on the most landward limits of the transgression and has not been found to underlie the whole of the transgressive-regressive wedge of Holocene sediment lying to seaward.

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