Firsoff (Martian crater)
impact crater on Mars
Firsoff is an impact crater in the region called Meridiani Planum in the Oxia Palus quadrangle of Mars, located at 2.66°N latitude and 9.42°W longitude. It is 90 km in diameter. It was named after British astronomer Axel Firsoff, and the name was approved in 2010.
Parts of the crater display many layers, as do some of the other craters in the region. Many places on Mars show rocks arranged in layers. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers. There is much evidence that at least some of the layers seen on Mars especially in Firsoff crater involve groundwater.
There are mounds in the crater that may have formed from springs. They show breccia sometimes a pit at the top.
The public source identifies “Firsoff (Martian crater)” as impact crater on Mars. This brief keeps that definition visible, then builds a research path around Firsoff, Martian and crater.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Nov 9, 2025. The linked authority identifier is Q19968570. Authority coordinates are 2.730, 350.630. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2010.
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This entry incorporates text from “Firsoff (Martian crater)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.