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Pre-Tolstojan
Pre-Tolstojan, also Pretolstojan Period, refers to the oldest period of the history of Mercury, 4500–3900 MYA. It is the "first period of the Eomercurian Era and of the Mercurian Eon, as well as being the first period in Mercury's geologic history", and refers to its formation and the 600 million or so years in its aftermath.〔(【引用サイトリンク】title=Pretolstojan Period )〕 Mercury was formed with a tiny crust, mantle, and a giant core and as it evolved it faced heavy bombardments that created most of the craters and intercrater plains seen on the planet's surface today.〔(【引用サイトリンク】title=Mercury )〕
Many of the smaller basins and multi-ring basins were created during this period. Considered a "dead" planet, its geology is highly diverse with craters forming the dominant terrain.〔
The name Pre-Tolstojan refers to the Tolstoj crater on the surface of Mercury, which is believed to have been formed in an impact event circa 3900 MYA. The latter has been named after the Russian writer Leo Tolstoy.
==History==
The history of Mercury is divided into five epochs; Pre-Tolstojan is the first epoch, the other four are Tolstojan, Calorian, Mansurian, and Kuiperian. Pre-Tolstojan stage I represents the formation stage of Mercury when it evolved as a tiny crust, mantle, and a giant core. During this period, multi-ring basins were created due to bombardment and concurrently formation of craters and intercrater plains also occurred.〔 The location of Lobate scarps and their relative age, overlaid on a geometric map of Mercury using Mariner 10 mosaics indicate that these formations occurred in pre-Tolstojan intercrater plains, and later during the Tolstojan and Calorian periods.
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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