Definition
Impact crater formed in a target with an upper layer of water. To allow the distinction of a marine-target crater from its counterpart formed on land (land-target crater), the thickness of the water layer must be sufficient to cause detectable effects on the cratering process, the lithologies, or the chemistry of the impactites. The primary evidence that a crater formed in a marine environment is a continuous marine sedimentation before and after the event (Therriault and Lindström 1995). The emphasis on the target in the term “marine target” compared with the sometimes occurring synonymous use of terms such as “marine crater” is to distinguish the crater formed by a marine impact event from that of a land-target crater that is later transgressed rendering it in a current submarine location. The event is a “marine impact,” and the resulting seafloor crater is a “marine-target crater.”
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References
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Ormö, J., Hargitai, H. (2014). Marine-Target Crater. In: Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9213-9_584-1
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DOI: https://doi.org/10.1007/978-1-4614-9213-9_584-1
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