Editing Caloris Planitia (section)

==Antipodal chaotic terrain and global effects==
[[File:Mercury weird terrain.jpg|thumb|Hilly, lineated terrain at the antipode of Caloris.]]
[[File:Mercury's 'Weird Terrain'.jpg|thumb|Close up of the chaotic terrain.]]

The giant impact believed to have formed Caloris may have had global consequences for the planet.  At the exact [[Antipodal point|antipode]] of the basin is a large area of hilly, grooved terrain, with few small impact craters that are known as chaotic terrain (also "weird terrain").<ref name="lakdawalla2011-04-19">{{cite web| url = https://www.planetary.org/blogs/emily-lakdawalla/2011/3004.html| title = Mercury's Weird Terrain| last = Lakdawalla| first = E.| author-link=Emily Lakdawalla| date = 19 April 2011| publisher = [[The Planetary Society]]| access-date= 2020-01-29}}</ref> It is thought by some to have been created as [[seismic wave]]s from the impact converged on the opposite side of the planet.<ref>{{cite journal |last=Schultz |first=P. H. |author2=Gault, D. E. |year=1975 |title=Seismic effects from major basin formations on the moon and Mercury |journal=The Moon |volume=12 |issue= 2|pages=159–177 |doi=10.1007/BF00577875 |bibcode=1975Moon...12..159S|s2cid=121225801 }}</ref> Alternatively, it has been suggested that this terrain formed as a result of the convergence of ejecta at this basin's antipode.<ref>{{cite journal
 | last=Wieczorek | first=Mark A. |author2=Zuber, Maria T.
 | title=A Serenitatis origin for the Imbrian grooves and South Pole-Aitken thorium anomaly
 | journal=Journal of Geophysical Research
 | year=2001 | volume=106 | issue=E11 | pages=27853–27864
 | url=https://hal.archives-ouvertes.fr/hal-02458520/file/Wieczorek%20and%20Zuber%2C%202001a.pdf
 | access-date=2008-05-12
 | doi=10.1029/2000JE001384 | bibcode=2001JGR...10627853W| doi-access=free}}</ref> This hypothetical impact is also believed to have triggered [[volcano|volcanic activity]] on Mercury, resulting in the formation of smooth plains.<ref>{{cite journal |last=Kiefer |first=W. S. |author2=Murray, B. C. |year=1987 |title=The formation of Mercury's smooth plains |journal=Icarus |volume=72 |issue= 3|pages=477–491 |doi=10.1016/0019-1035(87)90046-7 |bibcode=1987Icar...72..477K}}</ref> Surrounding Caloris is a series of geologic formations thought to have been produced by the basin's ejecta, collectively called the [[Caloris Group]].