Hasiuk and Lohmann (2008) present a geochemical study of cement and crinoid remains from the much studied Mississippian Muleshoe mud mound, New Mexico, U.S.A. They deduce Mississippian paleocean chemistry from data on altered cement and crinoids that are assumed to have recrystallized in sea water and retained their original marine chemistry. It is surprising in this context that they present data for just one brachiopod, as brachiopods are accepted as one of the most reliable marine proxies! They do not discuss the interpretation of Muleshoe brachiopod data made by Wu and Chafetz (2002). The latter authors differentiate intermound from...
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