Caloris Group

Van Eyck FormationOdin Formation
The Caloris group is a set of geologic units on Mercury.wikipedia
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Shakespeare quadrangle

Shakespeare
This ejecta is recognizable to a distance of about one basin diameter in the Tolstoj quadrangle and the adjacent Shakespeare quadrangle to the north.
Surrounding Caloris is a discontinuous annulus of its ejecta deposits, called the Caloris Group.

Caloris Planitia

Caloris BasinCalorisCaloris impact
McCauley and others have proposed the name “Caloris Group” to include the mappable units created by the impact that formed the Caloris Basin and have formally named four formations within the group, which were first recognized and named informally by Trask and Guest.
Surrounding Caloris is a series of geologic formations thought to have been produced by the basin's ejecta, collectively called the Caloris Group.

Caloris Montes

montes
A gap is present in the Caloris Montes toward the southeast; its origin is unknown, but it is somewhat similar to the gap on the east side of the Imbrium Basin, where the mountain ring cuts the edge of the Serenitatis Basin.
The Caloris Montes are only the innermost formation of the Caloris Group of formations produced by the Caloris Basin impact.

Mercury (planet)

MercuryMercurioplanet Mercury
The Caloris group is a set of geologic units on Mercury.

Mare Imbrium

ImbriumImbrium BasinSea of Rains
Like the Imbrium and Orientale Basins on the Moon, Caloris Basin is surrounded by an extensive and well-preserved ejecta blanket As on the Moon, where ejecta from the better preserved basins was used to construct a stratigraphy, the ejecta from the Caloris Basin also can be used as a marker horizon. The Van Eyck is similar in morphology but somewhat more degraded than the Fra Mauro Formation around the Imbrium Basin on the Moon; secondary cratering and ballistic deposition of ejecta from Caloris undoubtedly played an important role in its emplacement.

Stratigraphy

stratigraphicstratigraphicalstratigraphically
Like the Imbrium and Orientale Basins on the Moon, Caloris Basin is surrounded by an extensive and well-preserved ejecta blanket As on the Moon, where ejecta from the better preserved basins was used to construct a stratigraphy, the ejecta from the Caloris Basin also can be used as a marker horizon.

Marker horizon

marker bedmarker bedscorrelation
Like the Imbrium and Orientale Basins on the Moon, Caloris Basin is surrounded by an extensive and well-preserved ejecta blanket As on the Moon, where ejecta from the better preserved basins was used to construct a stratigraphy, the ejecta from the Caloris Basin also can be used as a marker horizon.

MESSENGER

Mercury MessengerMErcury Surface, Space ENvironment, GEochemistry and RangingMESSENGER Mercury probe
Undoubtedly, the ejecta also influences a large part of the terrain to the west that was recently photographed by MESSENGER.

Mare Nectaris

NectarisNectaris BasinSea of Nectar
It recognizes the existence of an orderly, in essence isochronous sequence of mappable units around Caloris that are similar in character to those recognized around the better preserved impact basins of the Moon such as Orientale, Imbrium, and Nectaris.

Escarpment

scarpscarpsescarpments
These massifs mark the crestline of the most prominent scarp or ring of the Caloris Basin and grade outward into smaller blocks and lineated terrain.

Montes Rook

Montes Rook Formation
The Caloris Montes Formation is very similar in morphology to and is considered the equivalent of the massif facies of the Montes Rook Formation around the Orientale Basin. The Nervo bears some resemblance to the Apennine Bench Formation around the Imbrium Basin; its closest counterpart in Orientale is the knobby facies of the Montes Rook Formation.

Mare Serenitatis

SerenitatisSea of SerenitySerenitatis Basin
A gap is present in the Caloris Montes toward the southeast; its origin is unknown, but it is somewhat similar to the gap on the east side of the Imbrium Basin, where the mountain ring cuts the edge of the Serenitatis Basin.

Massif

mountain massifmassifsmountainous massif
The Nervo Formation consists of rolling to locally hummocky plains that lie in intermassif depressions between the mountains formed by the Caloris Montes Formation.

Montes Apenninus

Mons WolffMons AmpèreApennine Mountains
The Nervo bears some resemblance to the Apennine Bench Formation around the Imbrium Basin; its closest counterpart in Orientale is the knobby facies of the Montes Rook Formation.

Mare Orientale

OrientaleOrientale BasinOrientale impact
Like the Imbrium and Orientale Basins on the Moon, Caloris Basin is surrounded by an extensive and well-preserved ejecta blanket As on the Moon, where ejecta from the better preserved basins was used to construct a stratigraphy, the ejecta from the Caloris Basin also can be used as a marker horizon. The Nervo bears some resemblance to the Apennine Bench Formation around the Imbrium Basin; its closest counterpart in Orientale is the knobby facies of the Montes Rook Formation.

Montes Alpes

Alpes FormationAlps
The distribution pattern of the Odin appears similar to that of the thinner, more distal parts of Alpes Formation of the Imbrium Basin on the Moon.

Odin Planitia

The Odin, like the Alpes, occurs in broad lobes such as those in Odin Planitia beyond the main basin scarp.

Fra Mauro formation

Fra MauroFra Mauro HighlandsFra Mauro Highlands region
The Van Eyck is similar in morphology but somewhat more degraded than the Fra Mauro Formation around the Imbrium Basin on the Moon; secondary cratering and ballistic deposition of ejecta from Caloris undoubtedly played an important role in its emplacement.

Borealis quadrangle

Borealis
No material similar to either the lineated or the secondary-crater facies of the Van Eyck Formation, the most distinctive and distant unit of the Caloris Group (McCauley and others, 1981), can be unambiguously identified in the Borealis region.

Michelangelo quadrangle

Michelangelo
Following the terminology developed by McCauley and others (1981) we have assigned them to the Van Eyck Formation, Secondary-Crater Facies.