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Accruva Formation
The Accruva Formation is one of multiple geologic units found on Venus. Abbreviated psh, it is also known as shield plains due to the shield like structures formed in its region. It is characterized by its abundant clusters of small shield dome structures located throughout the unit and lack of pervasive tectonic deformation. The domes that characterize the unit are likely volcanic edifices, the result of multiple small volcanic eruptions over an extended period of time. It formed during the second half of the Guineverian Period, in which vast plains formed globally on Venus. It is one of 14 formations identified by Mikhail A. Ivanov and James W. Head.
==Description==
The Accruva Formation is also known as shield plains because of the shield shaped structures that form in close proximity to each other. The surface of this area is notably different from the other 14 formations mapped on Venus due to the clusters of shield plains, the morphologically smooth transition from the shields to the plains in between the shield plains, and the low amount of deformation within this region, only observably containing a few wrinkle ridges. The shield structures themselves can range from a few kilometers to greater than 10 kilometers in diameter. The formation region tends to occur as equidimensional patches several tens to hundreds of kilometers across. The relief of the formation is hilly due to the clusters of shield domes. The hypsogram of the Accruva Formation almost perfectly matches the overall hypsogram of Venus, which indicates that this formation represents the general topographic level of Venus.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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