New observations of fracture corridors > 150 m tall and planes of bedding-parallel slip are integrated with sedimentological descriptions of the Asmari Formation to understand the main controls on the development of fractures in the Zagros Mountains of Iran. In the Kuh-e Pahn, foldrelated fracture corridors are axis-parallel (NW-SE) and occur in the crest of the anticline. They form by neutral surface folding, but at a critical dip of the beds (c. 15~ bedding-parallel slip by flexural slip folding is the predominant mechanism. This relationship is substantiated by curvature calculations. Crestal fractures have a large vertical extent in mechanical unit B (> 150 m), primarily due to the lithological homogeneity of massive packstones within the Asmari Formation. Northerly and easterly trending fracture corridors, interpreted from satellite imagery, are spatially unrelated to the detachment folding of the cover series, but represent the distributed effect of deepseated basement reactivation related to fault movement. These trends define high production zones in the nearby Gachsaran super giant oilfield. Observations from an adjacent eroded box fold, the Kuh-e Mish, with steeper dipping limbs (60~ revealed a contrast in the style of deformation, and we interpret these folds to represent different stages in box fold evolution.
SYNOPSIS New species of fossil crabs are described and figured from the Miocene and Pleistocene of Sabah and Sarawak. The following three genera and 20 species are new: ? Paguridae gen. et sp. nov.
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