Clifton Down Limestone | My Assignment Tutor

Clifton Down Limestone – Great Quarry. Date – 17 September 2020 Made By – Nick Koor Extremely strong, dark and light grey medium to fine grained LIMESTONE interbedded with very weak dark reddish brown and grey fine grained calcareous fissile mudstone (CLIFTON DOWN LIMESTONE). The limestone has numerous brachiopod fossils on bedding planes. The limestone is discoloured to light grey and the mudstone is discoloured to light grey. The Rock Mass is dissected by 3 major discontinuity sets: D1 bedding plane, and 2 joint sets D2 and D3, producing prismatic equidimensional and rhomboidal rock blocks. D1 Bedding Plane: Spacing is thick to very thick and the plane is  discoloured to light grey and reddish brown – schmidt hammer readings on the plane R Value Readings : 20, 28, 34, 24, 27, 28, 34, 40, 26, 24 .Dip / Dip Direction: 27/135, 24/136, 26/129. Very high persistence, terminates outside of the exposure. Large scale roughness is wavy, medium scale roughness is stepped, small scale roughness is rough. Profile comb over 200mm max amplitude 9mm, 22mm, 16mm. Roughness over 1m maximum amplitude 42mm, 34mm, 19mm, 31mm. Aperture is very wide to open infilled with fissile calcareous mudstone [As it is interbedded we describe how the apertures are infilled with very weak mudstone]. No seepage observed.  D2 Joint Set: Widely to very widely spaced discoloured on surface – Schmidt hammer readings on the plane R Value Readings 45, 22, 30, 45, 29, 30, 38, 26, 32, 34. Dip / Dip Direction 86/035, 82/035, 81/036. High persistence and they terminate within the rock mass against the D1 bedding. D2 is straight undulating rough. Profile comb 200mm max amplitude 12mm, 14mm, 9mm. Roughness over 1m max amplitude 25mm, 29mm, 15mm, 16mm. Aperture is ight to open, infilled with calcite. No seepage observed.  D3 Joint Set: Widely to very widely spaced, discoloured on surface – Schmidt hammer readings on the plane R Value Readings: 44, 52, 48, 39, 28, 38, 48, 50, 42, 48. Dip/Dip Direction: 77/321, 86/152, 70/321. High to very high and persistence terminates in rock mass against bedding D1 and D2. Straight, stepped and smooth: Profile comb 200mm max amplitude 38mm, 32mm, 7mm; Roughness over 1m max amplitude 49mm, 68mm, 82mm. Aperture: Tight, clean, dry Black Rock Quarry – Black Rock Limestone Date – 19 September 2020 Made By – Nick Koor Extremely strong, dark grey, fine grained micritic LIMESTONE with numerous crinoid and shell fragments (BLACK ROCK LIMESTONE). The Rock Mass is dissected by 3 major discontinuity sets: D1 bedding plane, and 2 joint sets D2 and D3, producing very large prismatic equidimensional and rhomboidal rock blocks. Bedding D1 – Very thickly bedded, discoloured and mineralised with calcite – Schmidt hammer readings on the plane R Value Readings:49, 38, 47, 42, 30, 55, 52, 42, 48, 38. Very high persistence, terminates outside outcrop. 27/130, 25/132, 26/134. Straight, planar and stepped, rough to smooth. Profile comb 200mm max amplitude 13mm, 13mm, 6mm.   Roughness over 1m max amplitude 23mm, 34mm, 25mm. Aperture: Very tight to open variably infilled with soil crushed rock or clean. Damp, no seepage.  Joint Set D2 – Very wide to widely spaced, discoloured and mineralised with calcite  – Schmidt hammer readings on the plane R Value Readings:35, 30, 38, 45, 32, 49, 26, 32, 28, 52. Highly persistent, terminates outside outcrop. 89/203, 86/205, 89/025. Straight, undulating and rough.  Profile comb 200mm max amplitude 9mm, 4mm, 7mm. Roughness over 1m max amplitude 35mm, 20mm, 16mm. Aperture: Very tight to moderately wide infilled calcite mineral coating or rock fragments. Dry. No seepage visible.   Joint Set D3 – Very widely spaced, discoloured and mineralised with calcite  – Schmidt hammer readings on the plane R Value Readings:49, 14, 32, 20, 38, 28, 16, 16, 50, 32 – low values on calcite mineralisation. Very high persistence, terminates outside of exposure. Dip Direction / Direction 82/056, 86/054, 89/048. Curved, stepped and rough. Profile comb 200mm max amplitude 5mm, 15mm, 20mm.  Roughness over 1m max amplitude 41mm, 102mm, 30mm. Aperture: Open to moderately wide infilled rock fragments and calcite mineralisation. Or clean. Dry, no seepage. Gully Oolite Quarry Rock Mass Description Black Rock Dolomitised Limestone Date 18 September 2020 Made by Nick Koor Extremely strong, dark to light brown, fine grained dolomitised LIMESTONE. Solution features developed around strike slip faults. Bedding planes are difficult to discern. (BLACK ROCK DOLOMITISED LIMESTONE). The Rock Mass is dissected by 2 major discontinuity sets: D1 bedding plane and a joint set D2 plus a large number of random discontinuities producing medium in-equidimensional rock blocks. D1 Bedding – Bedding extremely widely spaced, discoloured and mineralised with calcite – Schmidt hammer readings on the plane R Value Readings: 29, 23, 46, 47, 54, 54. High persistence, terminating within rock mass. Dip / Dip Direction: 17/073, 17/155, 35/100 Wavy, undulating, smooth. Profile comb 200mm max amplitude 19mm, 19mm, 12mm. Roughness over 1m max amplitude 30mm, 27mm, 35mm. Aperture: Tight to partly open, clean or infilled with calcite. Dry. Joint Set D2  – Medium to widely spaced, discoloured surface. Schmidt hammer readings on the plane R Value Readings:40, 32, 18, 38, 38, 26, 42, 42, 40, 41. Dip / Dip Direction 85/033, 81/022, 89/198. Very high persistence, terminating outside of outcrop. Wavy, stepped and rough. Profile comb 200mm max amplitude 28mm, 8mm, 29mm. Roughness over 1m max amplitude 23mm, 12mm, 29mm. Aperture: Very tight to moderately wide. Clean. Dry.  Fault Dip / Dip Direction 65/287 Slickensides. Trend 025 plunge 6 degrees to South West 3 metre zone of highly dolomitised and disrupted LIMESTONE with solution features up to 200mm across. Evidence of seepage. Fault plane damp with vegetation growth in opening. Kinematic indicators suggest hanging wall movement South West relative to footwall.  Gully Oolite Quarry Rock Mass Description Gully Oolite Limestone Date 18 September 2020 Made by Nick Koor Extremely strong, light brownish grey, fine to medium grained OOLITIC LIMESTONE, (GULLY OOLITE FORMATION). Bedding indistinct and only visible in the Southern face of Gully Oolite Quarry.  D1 Bedding Thickly bedded with a D/DD of 24 / 128. Very high persistence where visible. Roughness: straight, undulating, smooth, tight and clean. Dry. Note access to the bedding plane limited and exposure of the bedding plane not large enough to take roughness or Schmidt hammer measurements.  D2 Joint Medium to thinly spaced, discoloured. Schmidt hammer readings on the plane R Value Readings:43, 43, 24, 50, 50, 46, 37, 56, 48, 40. Very high persistence, terminates outside of exposure: 86/197, 89/026, 89/193. Curved, planar and stepped. Smooth surface discoloured. Profile comb 200mm max amplitude: 9mm, 4mm, 2mm. Roughness over 1m max amplitude: 5mm, 42mm, 15mm. Aperture: Very tight to partly opened. Clean. Dry. No other obvious well-defined joint sets. Many randomly orientated joints which split the rock up into small polyhedral and tabular blocks. 

QUALITY: 100% ORIGINAL PAPER – NO PLAGIARISM – CUSTOM PAPER

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