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mottling of beds

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Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall.

Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall....

Published: 18 March 2024
Fig. 12. Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall.
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Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall.

Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall....

Published: 18 March 2024
Fig. 13. Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall.
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Lambeth Group Reading Formation Upper Mottled Beds, further sea-level fall.

Lambeth Group Reading Formation Upper Mottled Beds, further sea-level fall....

Published: 18 March 2024
Fig. 16. Lambeth Group Reading Formation Upper Mottled Beds, further sea-level fall.
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Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall, Mid Lambeth Hiatus.

Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall,...

Published: 18 March 2024
Fig. 14. Lambeth Group Reading Formation Lower Mottled Beds, further sea-level fall, Mid Lambeth Hiatus.
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Sediments of the Lower Mottled Beds illustrating pedogenic alteration and unoxidized glauconite.

Sediments of the Lower Mottled Beds illustrating pedogenic alteration and u...

Published: 25 March 2013
Fig. 11. Sediments of the Lower Mottled Beds illustrating pedogenic alteration and unoxidized glauconite.
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GSI3D-modelled structure contours on base of Upper Mottled Beds. Contour interval is 1 m; range from −4 m OD in NW corner to −38 m OD in SE. Faults are marked in red with direction of downthrow shown by ticks. Modelling artefacts close to the fault planes should be disregarded. In most of the area, the dip is about 2° to the south; in the SE corner, which is south of the North London structural block (Fig. 1), the dip is to the east.

GSI3D-modelled structure contours on base of Upper Mottled Beds. Contour in...

Published: 01 November 2012
Fig. 6. GSI3D-modelled structure contours on base of Upper Mottled Beds. Contour interval is 1 m; range from −4 m OD in NW corner to −38 m OD in SE. Faults are marked in red with direction of downthrow shown by ticks. Modelling artefacts close to the fault planes should be disregarded. In most
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Contact between Upper Shelly and Upper Mottled Beds.

Contact between Upper Shelly and Upper Mottled Beds.

Published: 01 May 2011
Fig. 7 Contact between Upper Shelly and Upper Mottled Beds.
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Farringdon Station geology (Davis & Duarte 2015). MG, made ground; RTD, River Terrace deposits; LG, Lambeth Group; UMB, Upper Mottled Beds; LMB, Lower Mottled Beds; LB, Laminated Beds; LSB, Lower Shelley Beds; UF, Upnor Formation; TS, Thanet Sand Formation.

Farringdon Station geology ( Davis & Duarte 2015 ). MG, made ground; RT...

Published: 15 May 2019
Fig. 7. Farringdon Station geology ( Davis & Duarte 2015 ). MG, made ground; RTD, River Terrace deposits; LG, Lambeth Group; UMB, Upper Mottled Beds; LMB, Lower Mottled Beds; LB, Laminated Beds; LSB, Lower Shelley Beds; UF, Upnor Formation; TS, Thanet Sand Formation.
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Comparison of highly variably coloured weathered sediments in the Mottled Beds of the Lambeth Group in the Alum Bay, Isle of Wight, demonstrating the cross-cutting nature of worm and crustacean burrows, and rootlets. Above, view of different colours including large-scale red burrows in the vertically bedded Mottled Beds in situ in cliff. Below, microphotographs of the same sediments; field of view for each photograph is approximately 10 mm wide.

Comparison of highly variably coloured weathered sediments in the Mottled B...

Published: 18 March 2024
Fig. 22. Comparison of highly variably coloured weathered sediments in the Mottled Beds of the Lambeth Group in the Alum Bay, Isle of Wight, demonstrating the cross-cutting nature of worm and crustacean burrows, and rootlets. Above, view of different colours including large-scale red burrows
Journal Article

Stratigraphic Models and General Criteria for Recognition of Alluvial, Barrier-Bar, and Turbidity-Current Sand Deposits

John W. Shelton
Journal: AAPG Bulletin
Published: 01 December 1967
AAPG Bulletin (1967) 51 (12): 2441–2461.
DOI: https://doi.org/10.1306/5D25C27F-16C1-11D7-8645000102C1865D
... bedding overlies mottled bedding, and the grain size increases upward. The lower Pliocene Repetto “Formation” of the Los Angeles basin is characterized by a great thickness of turbidity-current sandstone, deposited in a deep-marine orogenic basin. The depositional basin was very similar to modern basins...
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View PDF for article title, Stratigraphic Models and General Criteria for Recognition of Alluvial, Barrier-Bar, and Turbidity-Current Sand Deposits
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Journal Article

Mineralogical and geochemical characterisation of warm-water, shallow-marine glaucony from the Tertiary of the London Basin

Jennifer Huggett, Jacob Adetunji, Fred Longstaffe, David Wray
Journal: Clay Minerals
Published: 01 March 2017
Clay Minerals (2017) 52 (1): 25–50.
DOI: https://doi.org/10.1180/claymin.2017.052.1.02
...Jennifer Huggett; Jacob Adetunji; Fred Longstaffe; David Wray Abstract Glaucony is present in the Palaeocene sediments of the London Basin, from the Thanet Sand Formation to the gravel beds at the base of the Lower Mottled Beds of the Reading Formation. The Upnor Formation glaucony is a rare...
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View PDF for article title, Mineralogical and geochemical characterisation of warm-water, shallow-marine glaucony from the Tertiary of the London Basin
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—Exposure of Jetmore equivalent in Bridge Creek Member, Greenhorn Limestone, Locality 3, showing burrow-mottled beds 3 through 11. Interval separating beds 6 and 7 is characteristically greater than that between other beds in lower part of sequence. The downwardly thickened part of bed 7 is unusual; such features are not characteristic of burrow-mottled limestones.

—Exposure of Jetmore equivalent in Bridge Creek Member, Greenhorn Limestone...

Published: 01 March 1971
Fig. 7. —Exposure of Jetmore equivalent in Bridge Creek Member, Greenhorn Limestone, Locality 3, showing burrow-mottled beds 3 through 11. Interval separating beds 6 and 7 is characteristically greater than that between other beds in lower part of sequence. The downwardly thickened part of bed 7
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Examples of Lambeth Group sediments showing up faulting. (a) and (b) both show Mottled Beds faulted against Laminated Beds; (c) shows repetition of units, London Clay–Lambeth Group–London Clay–Lambeth Group, indicating complex ground conditions.

Examples of Lambeth Group sediments showing up faulting. ( a ) and ( b ) bo...

Published: 18 March 2024
Fig. 25. Examples of Lambeth Group sediments showing up faulting. ( a ) and ( b ) both show Mottled Beds faulted against Laminated Beds; ( c ) shows repetition of units, London Clay–Lambeth Group–London Clay–Lambeth Group, indicating complex ground conditions.
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Comparison of highly variably coloured weathered sediments in the Mottled Beds of the Lambeth Group (a–c) compared with the dull grey brown London Clay Formation (d); (a) shows evidence of greyed rootlets, and (b) burrowing and gleying.

Comparison of highly variably coloured weathered sediments in the Mottled B...

Published: 18 March 2024
Fig. 21. Comparison of highly variably coloured weathered sediments in the Mottled Beds of the Lambeth Group ( a – c ) compared with the dull grey brown London Clay Formation ( d ); ( a ) shows evidence of greyed rootlets, and ( b ) burrowing and gleying.
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Plan view of Farringdon Station showing the surface projection of the main faults and the extent of sand lenses in 2009 and 2015 (Gakis et al. 2016). UMB, Upper Mottled Beds.

Plan view of Farringdon Station showing the surface projection of the main ...

Published: 15 May 2019
Fig. 10. Plan view of Farringdon Station showing the surface projection of the main faults and the extent of sand lenses in 2009 and 2015 ( Gakis et al. 2016 ). UMB, Upper Mottled Beds.
Journal Article

Widespread, Synchronously Deposited, Burrow-Mottled Limestone Beds in Greenhorn Limestone (Upper Cretaceous) of Kansas and Southeastern Colorado

Donald E. Hattin
Journal: AAPG Bulletin
Published: 01 March 1971
AAPG Bulletin (1971) 55 (3): 412–431.
DOI: https://doi.org/10.1306/5D25CF65-16C1-11D7-8645000102C1865D
...Fig. 7. —Exposure of Jetmore equivalent in Bridge Creek Member, Greenhorn Limestone, Locality 3, showing burrow-mottled beds 3 through 11. Interval separating beds 6 and 7 is characteristically greater than that between other beds in lower part of sequence. The downwardly thickened part of bed 7...
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View PDF for article title, Widespread, Synchronously Deposited, Burrow-<span class="search-highlight">Mottled</span> Limestone <span class="search-highlight">Beds</span> in Greenhorn Limestone (Upper Cretaceous) of Kansas and Southeastern Colorado
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Field photographs of beds: (A–C) tsunamites (sharp tops and bottoms indicated by arrows) covering red-green mottled beds at 51.3 m, 7.3 m, and 22.5 m, respectively, Mistaken Point; (D) white volcanic ash bed on sulfidic intertidal paleosol in Drook Formation at Pigeon Cove; (E) tempestite sandstone on seismite breccia, at 63.6 m, Mistaken Point. Hammer handles are 25 cm long. Arrows indicate sharp sedimentary contacts.

Field photographs of beds: (A–C) tsunamites (sharp tops and bottoms indicat...

Published: 01 May 2014
Figure 5. Field photographs of beds: (A–C) tsunamites (sharp tops and bottoms indicated by arrows) covering red-green mottled beds at 51.3 m, 7.3 m, and 22.5 m, respectively, Mistaken Point; (D) white volcanic ash bed on sulfidic intertidal paleosol in Drook Formation at Pigeon Cove; (E
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Clastic facies association. Facies codes: G+S, mixed conglomerate–sandstone bed; (n), mottled bed with carbonate nodules; mG, muddy conglomerates; sG, sandy conglomerates; Sm, massive sandstones; Sc, cross-bedded sandstones; Sh, parallel-laminated sandstones; Sr, rippled sandstones; F, siliciclastic mudstones. A) Schematic log of the facies of this association, showing their characteristic random distribution and interbedding with sandy limestones. B) Bed of parallel-laminated sandstone. C) A sigmoid-like cross-bed set of the cross-bedded sandstones showing convex-upwards topsets and tangential bottomsets. D) Top surface of cross-bedded sandstones with horizontal burrows. Note that burrows commonly cross each other and locally show Y-shaped branching. E) Rippled sandstone bed. F) Sandstone photomicrograph with a pebble of Jurassic oolitic limestone and individual Jurassic ooids included as sandstone grains. Red arrows point to small sac-like borings at the borders of the oolitic pebble and of the ooids. Note that borders of the ooids within the pebble (blue arrow) are not bored. G) Photomicrograph of a sandstone that contains a Jurassic lithoclast (upper right) formed mainly by bioclasts and ooids (green arrows). Ooids (red arrows) and bioclasts (echinoid plates, blue arrows) from the Jurassic lithoclasts are also included as individual grains in the sandstone. H) Beds of the clastic facies association showing orange-red mottling at the top (upper left) and vertically elongated white carbonate nodules. I) Detail of a mottled sandstone bed with wide and long white carbonate nodules.

Clastic facies association. Facies codes: G + S , mixed conglomerate–sands...

Published: 01 February 2015
Fig. 11.— Clastic facies association. Facies codes: G + S , mixed conglomerate–sandstone bed; (n) , mottled bed with carbonate nodules; mG , muddy conglomerates; sG , sandy conglomerates; Sm , massive sandstones; Sc , cross-bedded sandstones; Sh , parallel-laminated sandstones; Sr
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Core photograph of the Amoco-Poncho 14 core (Sec. 34, T3S, R59W) showing the contact between MS-2 and MS-3 at 6048 ft (1844 m). Note the root casts and mottled bedding the 6050 ft mark and the abrupt introduction of bioturbated sediment at the 6048.3 ft mark and above.

Core photograph of the Amoco-Poncho 14 core (Sec. 34, T3S, R59W) showing th...

Published: 01 February 2000
Figure 11 Core photograph of the Amoco-Poncho 14 core (Sec. 34, T3S, R59W) showing the contact between MS-2 and MS-3 at 6048 ft (1844 m). Note the root casts and mottled bedding the 6050 ft mark and the abrupt introduction of bioturbated sediment at the 6048.3 ft mark and above.
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Diagrammatic representations of bedding bounding surfaces and internal bedding. (A) Disorganized high-angle bedding with abundant internal bedding surfaces grouped into sets with similar dip directions truncated by disorganized bedding bounding surfaces. (B) Disorganized low-angle bedding defined by disorganized bedding bounding surfaces without internal bedding. (C) Organized low-angle bedding with internal bedding surfaces grouped into sets with similar dip directions truncated by organized bedding bounding surfaces. (D) Organized low-angle bedding defined by organized bedding bounding surfaces without internal bedding. (E) Horizontal bedding defined by low–dip angle bedding bounding surfaces. (F) Bedding types identified from image log categorized by dip angles and direction, lower bed f bedding, organized low-angle mottled bedding, and horizontal bedding. N/A = not applicable.

Diagrammatic representations of bedding bounding surfaces and internal bedd...

Published: 01 May 2017
bounding surfaces without internal bedding. (E) Horizontal bedding defined by low–dip angle bedding bounding surfaces. (F) Bedding types identified from image log categorized by dip angles and direction, lower bed f bedding, organized low-angle mottled bedding, and horizontal bedding. N/A = not applicable.