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Depositional environments of the f-Member of the Qum Formation, in the Central Basin of Iran, have been reconstructed by two approaches: (1) a detailed petrographic analysis of microfacies (MF); (2) an analysis of the vertical superposition of the microfacies using contingency tests. Both approaches reveal a vertical sequence of eight microfacies designated by letters A-H. Based on petrographic characteristics...
Large cement-filled cavities (0.2 to 1.5 m wide) are well developed in slope-margin sediments of the spectacular Upper Devonian (Frasnian) reefs of the Canning Basin, Western Australia, where they account for up to 50% of the primary porosity. These are here interpreted as primary reef framework cavities that formed beneath a variety of domal, tabular or laminar stromatoporoid sponges. Of particular...
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