SK4270 : Duckmanton Railway Cutting - Cone in cone features

taken 8 years ago, near to Arkwright Town, Derbyshire, Great Britain

Duckmanton Railway Cutting - Cone in cone features
Duckmanton Railway Cutting - Cone in cone features
An in float sample, at first presumed to be leaves but I have been informed they are more likely cone in cone features (see below). The SSSI is often used by geology groups and schools, hence samples like this are left by them for others to enjoy. I have a picture with a scale bar if you wish to see it.

The identification of the Duckmanton Railway Cutting, as fossil plants, may be incorrect. To me by looking only at a photo, this looks like "cone-in-cone", a sedimentary feature that commonly occurs in clay type lithologic units, like shale. Cone-in-cones are the result of the clay layer being compressed by the overburden. The horizontal lines that make it look like a plant leaf are somewhat akin to microfaulting as the clay compresses; part of the layer slips away from the point of compression. Cone-in-cones will occur on the top and bottom of shale layers (on top they point up and bottom point downward). As these cone-in-cones weather and fall from the layer, they are conical in shape and sometimes mistaken for dinosaur teeth. Another similar feature is shatter cones found in meteor craters. The points of the shatter cones point toward the meteor's angle at impact, the source of the compression [For example the Sudbury Ni-Cu ore deposit in Ontario, Canada - Ashley].

Many thanks to B.Beasley for this:
Duckmanton Railway Cutting
Duckmanton railway cutting is on a long dismantled railway line of the old Lancashire, Derbyshire & East Coast Railway (LD&ECR) from Chesterfield to Lincoln. It was proposed by William Arkwright, a descendant of the industrial pioneer Sir Richard Arkwright. William owned the Sutton Scardale estate LinkExternal link.
The railway opened in 1897 with two large tunnels at Duckmanton and Bolsover. A history can be found here LinkExternal link
Since closure the National coal board have infilled the tunnel but not the cutting. Thankfully it has become a geological SSSI under management of the Derbyshire wildlife trust. Split into two sections by a blocked road bridge LinkExternal link. The most eastern side has little exposures but the old Great Central railway and site of Arkwright colliery can be seen. Crossing the road and walking down the steps into the main bulk of the reserve to the west of the bridge.
Muds, sand stones, seat earths and coal are exposed well along this cutting. All dipping at a steep angle in a NW-SE trend, this is because of the Brimington anticline. A large 'buckle' of strata that exposed the seams at the surface.
Not only is that good but an important title of GSSP or a global stratigraphic section and point has been given. Meaning this location determines the boundary between certain lengths of time. This example being boundary the between the Duckmantion and Langsettian sub ages of the Carboniferous. Bivalve fossils date to 311.7ma. The marine band in question is the Vanderbeckei, correlated throughout the coalfield, the last major marine band before the huge economic deposits of coal. The change from seat earth to coal then marine and non marine bands are evidence for sea level rise, common in a period of ice ages.
Entering the cutting is by permit only.
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SK4270, 49 images   (more nearby )
Photographer
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Date Taken
Saturday, 19 March, 2011   (more nearby)
Submitted
Sunday, 20 March, 2011
Category
Fossil tree   (more nearby)
Subject Location
OSGB36: geotagged! SK 422 703 [100m precision]
WGS84: 53:13.7218N 1:22.0959W
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