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Download (4.24 End of the Kiaman Superchron in the Permian of SW England: Magnetostratigraphy of the Aylesbeare Mudstone and Exeter groups. Mark W. Hounslow, Gregg McIntosh, Richard A. Edwards, Deryck Laming, Vassil Karloukovski Supplementary Data The data here is composed of: Table s1: Sampling site details, and mean magnetic properties. Figure s1. The new bed-division of the Littleham Mudstone Fm, placed onto the photographs of the cliff outcrops. Figure s2. Rose diagrams of the AMS Kmax axes, in the Aylesbeare Mudstone Group, against the sediment logs of the section. Figure s3. The spatial variation in the AMS Kmax axes, of all Permian-Triassic west of Sidmouth, placed onto their sampling sites, and the palaeocurrent directions inferred from the sedimentology. Figure s4. Component A data, and details of demagnetisation characteristics. Figure s5. Additional rock magnetic data, pertaining to magnetic mineralogy Figure s6. Petromagnetic data for all palaeomagnetic specimens. Figure s7. Virtual geomagnetic pole data for Permian Europe, and a discussion of how the new data here fits with this data. References. Section No. on Grid ref Lat/long Bedding NH J0 klf Formation/unit Fig 1 strike/dip (x10-3 (x10-5 A/m) SI) Budleigh Salterton to 1 SY040802 to 50.622N: - 302/5 38 3.2 2.1 Littleham Mudstone Fm (LMF) Littleham Cove SY063817 3.342W Straight Point to Maer 2 SY040802 to 50.608N: - 340/5 to 60 4.0 1.35 Exmouth Mudstone and Sandstone SY011799 3.376W 013/8 Fm (EMSF), base of LMF Sowden Lane to 3 SX990836 to 50.638N: - 321/9 to 10 2.1 3.3 Base of EMSF, top of Exe Breccia Lympstone Harbour SX988842 3.441W 315/8 Fm Clyst St Mary Garage 4 SX976910 50.710N: - 045/5 2 2.4 0.68 Dawlish Sandstone Fm 3.454W Bishops Court Quarry 5 SX965915 50.711N: - 045/5 6 0.74 0.57 Dawlish Sandstone Fm 3.465W Langstone Rock 6 SX980779 50.598N: - 293/8 6 2.8 7.6 Exe Breccia Fm 3.445W Dawlish Station 7 SX964767 50.580N: - 293/10 5 1.4 2.7 Teignmouth Breccia Fm 3.465W Coryton Cliff and Cove 8 SX962762 50.577N: - 319/10 8 1.5 1.9 Teignmouth Breccia Fm 3.468W Holcombe Beach 9 SX957746 50.562N:- 342/12 2 2.4 5.1 Teignmouth Breccia Fm 3.475W Ness Point to Bundle 10 SX941720 to 50.533N: - 355/0 to 6 7.2 9.8 Oddicombe Breccia Fm Head SX937712 3.500W 295/5 Maidencombe Beach 11 SX928684 50.505: - 275/10 to 5 9.3 7.0 Oddicombe Breccia Fm 3.514 346/6 Whitsand to Watcombe 12 SX927674 50.496: - 315/41 to 5 5.8 6.4 Watcombe Fm and Oddicombe Beachs 3.515 288/25 Breccia Fm West Sandford Not on SS811027 50.812N: - 105/14 1 10.8 12.1 Knowle Sandstone Fm Fig. 1 3.689W Table. s1. Section and site details sampled, and average magnetic properties of the samples. NH number of sampled horizons, Jo= Initial natural remanent magnetisation intensity, klf= low frequency magnetic susceptibility. Most samples were collected from the sea cliffs, with those from Bishops Court Quarry from a working quarry (Table s1). Those from Dawlish Station and West Sandford were from small cuttings. Samples from below bed B to the base of bed A (Fig. 5), in the Exmouth Mudstone and Sandstone Fm, were from foreshore exposures and sea-cliffs, east of Exmouth. In the breccia units, suitable units for palaeomagnetic sampling were thin, discontinuous sandstone and mudstone beds. Foot bridge over Littleham Mudstone Littleham Cove Panel i) Fm small stream 2 3 Top 4 B A 1 Division Littleham Cove Fault 3 Straight Point Inferred Fault Sandstone Mbr WSW Panel ii) West Down Beacon Base BSPB 2 The Floors 3 B Division C A B A 2 3 1 Top Div. A Division B Gap between photos 3 Base div. B at beach level Fig.s1. Annotated photos of the cliff between Littleham Cove (panel i) and Budleigh Salterton (panel iv), indicating the bed and division sub-division of the Littleham Mudstones Formation. The three sub-divisions are a lower division A, mid division B, and an upper division C. The oldest part of the division A is exposed on the west side of the Littleham Cove fault. The W-E correlation across the Littleham Cove fault is not entirely clear, but the three sandstone beds (bed -1 in division A) may correlate to the upper-most units exposed west of the fault in the cliff adjacent to the path down the cliff. The succession is interrupted by a number of small landslips, which make the stratigraphy difficult to follow at beach level, without the photographs. The full succession can be examined by using the headwall scars behind the landslips. Panel iii) Gap between BSPB photos BSPB 3 Div. C 2 Div. C Interval with 4 many paler 1 beds 3 Div. B Div. B Panel iv) ENE est Down House W EM41 BSPB Top div. C EM40 BSPB 3 beds Gap between photos 3 Base div. C 4 4 Fish-eye nodules Impersistant sandstone bed Impersistant pale beds in small waterfall between A.3 and A.4 ~700 m to beach entry point Fig.s1. Panels iii) and iv) N 5 4 3 2 N Budleigh Salterton 200 1 5 L136-138 4 Pebble Beds Fm 0 N 3 0 L103-105 5 L139-141 2 L100-102 4 EM41 1 3 EM40 180 Littleham Mudstones 0 L44-46 N L142-144 2 EM34 4 N=4 EM33 EM25 1 N=19 L1-2 20 EM31 EM26 0 EM30 E30-31 N L42-43 J 3 160 5 L39-40 N=4 Mudstones 4 2 E34-35 Division C 3 N 40 5 N=5 L37-38 1 E32-33 2 4 140 1 0 3 EL60-62 I2 2 L35-36 5 EL63 EM24 1 60 E38-39 EL64-66 0 L30-32 EM22 4 120 EM23 L33-34 I1 N=5 3 EL58-59 EM21 E36-37 L26-27 80 E12 H Division B N L28-29 E10-11 N=14 2 5 100 E13-14 N 4 Littleham Mudstone Fm 3 L20-21 1 100 L22-23 N=18 E15-16 2 L24-25 1 4 80 E17-18 0 E19-20 120 L18-19 3 E21-22 L118-120 L121-123 E23-25 60 G N=10 L16-17 EM27 L124-126 EM28 L14-15 Mudstones L127-129 E26 F 140 E29 A L130-132 E40-42 L11-13 2 L133-135 40 E43-44 L109-111 Division E 160 L112-114 E45-46 L115-117 D L9-10 20 E47-48 N L106-108 E8-9 E6 C 5 L7-8 E4-5 4 L5-6 1 E1-3 180 L3-4 BB 3 +Mudstone 2 below 0 EL28-30 beach 1 EL40-42 0 Metres 200 EL31-33 N EL46-48 EL43-45 5 EL34-36 20 4 Key Fluvial x-bedding EL37-39 EL55-57 3 N=12 EL52-54 2 Normal Polarity Parallel lamination EL49-51 1 Reverse Polarity EL25-27 40 0 Uncertain Polarity Erosional boundary EL22-24 N Shallow Channels EL19-21 5 EL16-18 4 EL13-15 Sandstone dykes 3 60 EL10-11 N=9 Breccia EL7-9 2 Bioturbation EL4-6 EL1-3 A 1 Sandstone with E53-54 A breccia layers Rootletting E55 0 and calcrete Sandstone ~ 40m gap Fault with 80 Siltstone & mudstone E49-51 unknown throw with breccia layers Exmouth Sandstones and Mudstones Fm E58-60 E52 Red siltstone & mudstone Fining-up E56-57 N=8 sequences N Green marl/siltstone bed EB7 Hard marl bed 100 Fish-eye EB6 Aeol 5 nodules EB5 4 N=18 3 EB4 2 EB3 Metres 1 EB2 0 120 Exe Breccia Fm plus ~ 65 m of EBF Fig.s2. Kmax axis directions for samples from the Aylesbeare Mudstone Group. The directions have been mirrored about the 0-180 axis. The Kmax axes directions illustrate the similarity in ENE or easterly flow directions between the Exe Breccia and the lower part of the Exmouth Mudstone and Sandstone Fm. The directions in the upper part of the Group are more variable, but likely indicate a more NE direction of sediment transport. The SE-NW Kmax axes trends seen in the mudstones above bed G, and particularly in the Littleham Mudstones Fm may represent NW directed wind transport of the clay and silt in these units. N N 30 10 25 8 20 Otter N 15 6 5 BSPB 10 4 5 SST 4 0 2 3 0 2 1 N=140 0 3 N=12 N=19 Otter Sandstone (X-bedding) 1 N Palaeowind ? 5 4 2 3 2 1 0 6 N N 5 N=46 5 4 4 3 3 2 7 2 1 8 1 0 N N 0 N 5 5 5 N=31 4 N=6 4 4 N 3 N=12 3 3 Mudstones 5 4 2 9 2 2 3 1 1 1 2 0 0 0 1 0 N=12 N=8 N N=32 5 4 Sandstones 3 N 2 10 5 1 Dawlish Sandstone: aeolian 4 N 0 3 5 2 N=8 4 3 1 N=13 0 2 Bishops N=15 1 Court 0 N x-bedding 5 11 4 3 2 12 1 0 palaeowindDawlish N=12 Aeolian cross-bedding Observed transport direction Inferred fluvial transport direction Fig.s3. Summary of transport directions and Kmax axis directions for samples from the entire Permian, and Triassic successions west of Budleigh Salterton.
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