Difference between revisions of "Geology of the Andover area: Concealed strata - Triassic"

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{{AndoverSE}}
 
{{AndoverSE}}
===Triassic===
 
  
 
Triassic rocks are absent in the east of the district but are present in the Upper Enham 1 Borehole and continue to thicken westwards in seismic sections to a total thickness of approximately 520 m at the western limit of the district.
 
Triassic rocks are absent in the east of the district but are present in the Upper Enham 1 Borehole and continue to thicken westwards in seismic sections to a total thickness of approximately 520 m at the western limit of the district.
  
 
===== Sherwood Sandstone Group (SSG) =====
 
===== Sherwood Sandstone Group (SSG) =====
 
 
The Sherwood Sandstone Group consists of red, yellow and brown sandstone that is pebbly in places along with subordinate red mudstone and siltstone. It is estimated to be between 0 and 230 m thick in this district. The upper boundary of this unit is gradational into the Mercia Mudstone Group above.
 
The Sherwood Sandstone Group consists of red, yellow and brown sandstone that is pebbly in places along with subordinate red mudstone and siltstone. It is estimated to be between 0 and 230 m thick in this district. The upper boundary of this unit is gradational into the Mercia Mudstone Group above.
  
 
===== Mercia Mudstone Group (MMG) =====
 
===== Mercia Mudstone Group (MMG) =====
 
 
The Mercia Mudstone Group consists of dominantly red, less commonly green-grey, mudstones and subordinate siltstones; they are unlikely to be thick enough to contain halite-bearing units. Thin beds of gypsum or anhydrite are widespread and some sandstones may also be present. It is estimated to be between 0 and 270 m thick in this district.
 
The Mercia Mudstone Group consists of dominantly red, less commonly green-grey, mudstones and subordinate siltstones; they are unlikely to be thick enough to contain halite-bearing units. Thin beds of gypsum or anhydrite are widespread and some sandstones may also be present. It is estimated to be between 0 and 270 m thick in this district.
  
 
===== Penarth Group (PnG) =====
 
===== Penarth Group (PnG) =====
 
 
The Penarth Group consists of grey to black mudstones with subordinate limestones and sandstones; the group is predominantly marine in origin. It is estimated to be between 10 and 20 m thick in this district.
 
The Penarth Group consists of grey to black mudstones with subordinate limestones and sandstones; the group is predominantly marine in origin. It is estimated to be between 10 and 20 m thick in this district.
  
== Geology of the Andover area - contents ==
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== Geology of the Andover area contents ==
 
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{{Andoverpages}}
[[Geology of the Andover area: Introduction|Introduction]]
 
 
 
: [[Geology of the Andover area: Geological setting|Geological setting]]
 
 
 
[[Geology of the Andover area: Concealed strata|Geological description ]]
 
 
 
: [[Geology of the Andover area: Concealed strata|Concealed strata]]
 
 
 
:: [[Geology of the Andover area: Concealed strata - Ordovician to Devonian|Ordovician to Devonian]]
 
 
 
:: [[Geology of the Andover area: Concealed strata - Carboniferous|Carboniferous]]
 
 
 
:: [[Geology of the Andover area: Concealed strata - Permian|Permian]]
 
 
 
:: '''Triassic'''
 
 
 
:: [[Geology of the Andover area: Concealed strata - Jurassic|Jurassic]]
 
 
 
:: [[Geology of the Andover area: Concealed strata - Cretaceous|Cretaceous]]
 
 
 
: [[Geology of the Andover area: Exposed strata - Upper Greensand Formation|Exposed Strata]]
 
 
 
:: [[Geology of the Andover area: Exposed strata - Upper Greensand Formation|Upper Greensand Formation (UGS)]]
 
 
 
:: [[Geology of the Andover area: Exposed strata - Chalk Group|Chalk Group]]
 
 
 
:: [[Geology of the Andover area: Exposed strata - Palaeogene|Palaeogene]]
 
 
 
:: [[Geology of the Andover area: Exposed strata - Quaternary|Quaternary]]
 
 
 
:: [[Geology of the Andover area: Exposed strata - Artificial ground|Artificial ground]]
 
 
 
[[Geology of the Andover area: Applied geology - Hydrogeology|Applied geology]]
 
 
 
: [[Geology of the Andover area: Applied geology - Hydrogeology|Hydrogeology]]
 
 
 
: [[Geology of the Andover area: Applied geology - Bulk minerals|Bulk minerals]]
 
 
 
: [[Geology of the Andover area: Applied geology - Geotechnical considerations and hazards|Geotechnical considerations and hazards]]
 
 
 
[[Geology of the Andover area: Information resources|Information resources]]
 
 
 
[[Geology of the Andover area: References|References]]
 
 
 
 
 
 
[[Category:Andover - the geology of the area| 007]]
 
[[Category:Andover - the geology of the area| 007]]

Latest revision as of 16:20, 28 July 2015

This page is part of a category of pages providing a summary of the geology of the Andover district (British Geological Survey Sheet 283), which extends over approximately 600 km2 of north-west Hampshire and a small part of eastern Wiltshire. Links to other pages in this category can be found at the foot of the page.
Authors: J Thompson, K A Lee, P M Hopson, A R Farrant, A J Newell, R J Marks, L B Bateson, M A Woods, I P Wilkinson and N J Smith.

Triassic rocks are absent in the east of the district but are present in the Upper Enham 1 Borehole and continue to thicken westwards in seismic sections to a total thickness of approximately 520 m at the western limit of the district.

Sherwood Sandstone Group (SSG)

The Sherwood Sandstone Group consists of red, yellow and brown sandstone that is pebbly in places along with subordinate red mudstone and siltstone. It is estimated to be between 0 and 230 m thick in this district. The upper boundary of this unit is gradational into the Mercia Mudstone Group above.

Mercia Mudstone Group (MMG)

The Mercia Mudstone Group consists of dominantly red, less commonly green-grey, mudstones and subordinate siltstones; they are unlikely to be thick enough to contain halite-bearing units. Thin beds of gypsum or anhydrite are widespread and some sandstones may also be present. It is estimated to be between 0 and 270 m thick in this district.

Penarth Group (PnG)

The Penarth Group consists of grey to black mudstones with subordinate limestones and sandstones; the group is predominantly marine in origin. It is estimated to be between 10 and 20 m thick in this district.

Geology of the Andover area — contents