2021

NX8552 : Rascarrel Formation - basal conglomerate

taken 3 years ago, near to Rockcliffe, Dumfries And Galloway, Scotland

Rascarrel Formation - basal conglomerate
Rascarrel Formation - basal conglomerate
A wider view of the same rock (from the east side) is shown here: NX8552 : Sandy bay east of Castlehill Point

"Lower Carboniferous strata are exposed for 1.2 km eastwards along the shore. The section is rocky and can be properly examined only at low tide. The dip is generally to the south and decreases from about 50° within 10m of the fault to less than 15° over a distance of 30 m seawards. The basal strata are conglomerates, rich in clasts of porphyritic andesite and granite. These pass into arkosic sandstones and dark grey laminated siltstones and mudstones (Deegan, 1973; Craig and Nairn, 1956). Some of the sandstones and finer-grained rocks contain marine fossils. All these beds have been assigned to the Rascarrel Formation (BGS, 1993a). Deegan (1973) interpreted the conglomerates and coarse-grained sandstones as the deposits of alluvial fans which passed laterally and upwards into shallow-marine sediments. Rapid lithological variations of this nature may be attributed to intermittent movement on the basin-margin fault and/or external factors affecting sea level. Some of the steeply dipping strata nearest the fault contain liquefaction structures and extensional faults interpreted by Ord et al. (1988) as the effects of seismicity on unlithified or semi-lithified sandstones."
LinkExternal link

Creative Commons Licence [Some Rights Reserved]   © Copyright Andrew Curtis and licensed for reuse under this Creative Commons Licence.
Geographical Context: Coastal Geological interest Estuary, Marine Rocks, Scree, Cliffs Primary Subject: Rock
This photo is linked from: Automatic Clusters: · East [14] · Low Tide [6] Other Photos: · Sandy bay east of Castlehill Point ·
1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
+
+
1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
TIP: Click the map for more Large scale mapping
Grid Square
NX8552, 121 images   (more nearby 🔍)
Photographer
Andrew Curtis   (more nearby)
Date Taken
Thursday, 1 July, 2021   (more nearby)
Submitted
Saturday, 3 July, 2021
Subject Location
OSGB36: geotagged! NX 8569 5247 [10m precision]
WGS84: 54:51.2357N 3:46.9248W
Camera Location
OSGB36: geotagged! NX 85694 52463
View Direction
NORTH (about 0 degrees)
Clickable map
+
NW N NE
W Go E
SW S SE
Image Type (about): geograph 
This page has been viewed about 22 times
You are not logged in login | register