By Loren Eiseley
VERY-GOOD HARDBACK IN DUSTJACKET THAT used to be ideal yet backside 2 INCHES OF entrance obtained CRUMPLED UP AND TORN ON aspects (MENDED yet nonetheless no longer nice LOOKING).
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Some ancient evaporite successions of great areal extent may reach over I km in thickness. 1 Chemical composition and selected values of lAP (ion activity product) and K (solubility product) for halite, gypsum and anhydrite in seawater solutions (after Berner 1971). ·2H 2 O CaSO. 1 To show the effects of seawater evaporation upon brine volume, density and type of salt precipitate (after Valyashko 1972). - ---------- ~-~~~-~~~~:~~~~~~;~==~ bischofite , .. - •• - • MgSO ~::;;:;:=F 'i>'f I, halite 20 o - ,,- gy_p_su_m__ t;:==i.
The working life of this stain is abollt one day only. Etch uncovered thin section or polished block m 2% HCI (made up with 98 ml distilled water and 2 ml conc. ), for 20 s. Wash immediately in distilled water. Immerse section or block in staining solution for 4 min. Remove and gently wash with distilled water. Allow thin section to dry before cover slip is glued on. Many workers find it useful to stain only half of a thin section since the stain may overprint and obscure som~ fine petrographic detail.
2), one of the most useful being the volume diameter, defined as the diameter of a sphere having the same volume as the grain in question. In the following account, grains will be treated as spheres or spheroids for the sake of simplicity and space. However, the reader should remember that many grains, particularly fragmented bioclastic debris, present grave problems in rational particle size analysis because of their shapes. It should be noted that grain mass varies as the cube of the radius for spheroids.