DOCSLIB.ORG

The Geological Framework of the Frome-Piddle Catchment

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Geological Framework of the Frome-Piddle Catchment The Geological Framework of the Frome-Piddle Catchment Integrated Geoscience Surveys - Southern Britain Commissioned Report CR/02/197 N BRITISH GEOLOGICAL SURVEY COMMISSIONED REPORT CR/02/197N The Geological Framework of the Frome-Piddle Catchment Newell, A J, Royse, K R, Barron, A J M and Woods, M A The National Grid and other Ordnance Survey data are used with the permission of the Con- troller of Her Majesty’s Station- ery Office. Ordnance Survey licence number GD 272191/1999 Key words Geology, Dorset, Chalk, Palaeo- gene, Structure Front Cover Shaded relief image of the Frome-Piddle Catchment Bibliographical reference Newell, A J, Royse, K R, Barron, A J M and Woods, M A. 2002. The Geological Framework of the Frome-Piddle Catchment. British Geological Survey Com- missioned Report. CR/02/197 © NERC 2002 Keyworth, Nottingham British Geological Survey 2002 BRITISH GEOLOGICAL SURVEY The full range of Survey publications is available from the BGS Keyworth, Nottingham NG12 5GG Sales Desks at Nottingham and Edinburgh; see contact details 0115-936 3241 Fax 0115-936 3488 below or shop online at www.thebgs.co.uk e-mail: [email protected] The London Information Office maintains a reference collection www.bgs.ac.uk of BGS publications including maps for consultation. Shop online at: www.thebgs.co.uk The Survey publishes an annual catalogue of its maps and other publications; this catalogue is available from any of the BGS Sales Murchison House, West Mains Road, Edinburgh EH9 3LA Desks. 0131-667 1000 Fax 0131-668 2683 The British Geological Survey carries out the geological survey of e-mail: [email protected] Great Britain and Northern Ireland (the latter as an agency service for the government of Northern Ireland), and of the surrounding London Information Office at the Natural History Museum (Earth continental shelf, as well as its basic research projects. It also un- Galleries), Exhibition Road, South Kensington, London SW7 2DE dertakes programmes of British technical aid in geology in devel- oping countries as arranged by the Department for International 020-7589 4090 Fax 020-7584 8270 Development and other agencies. 020-7942 5344/45 email: [email protected] The British Geological Survey is a component body of the Natural Environment Research Council. Forde House, Park Five Business Centre, Harrier Way, Sowton, Exeter, Devon EX2 7HU 01392-445271 Fax 01392-445371 Geological Survey of Northern Ireland, 20 College Gardens, Bel- fast BT9 6BS 028-9066 6595 Fax 028-9066 2835 Maclean Building, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB 01491-838800 Fax 01491-692345 Parent Body Natural Environment Research Council, Polaris House, North Star Avenue, Swindon, Wiltshire SN2 1EU 01793-411500 Fax 01793-411501 www.nerc.ac.uk Contents 1 Introduction 1 1.1 Regional Geological Setting ............................................................................................... 1 1.2 Analysis of catchment area surface geology ....................................................................... 1 2 Solid geology of the Frome-Piddle Catchment .................................................................... 3 2.1 Jurassic-Early Cretaceous Strata ......................................................................................... 3 2.1.1 Lower Jurassic strata ............................................................................................................................. 3 2.1.2 Inferior Oolite Formation ...................................................................................................................... 3 2.1.3 Fuller's Earth Formation ........................................................................................................................ 3 2.1.4 Frome Clay Formation .......................................................................................................................... 3 2.1.5 Forest Marble Formation ....................................................................................................................... 3 2.1.6 Cornbrash Formation............................................................................................................................. 3 2.1.7 Kellaways Formation ............................................................................................................................ 3 2.1.8 Oxford Clay Formation ......................................................................................................................... 3 2.1.9 Corallian Group ..................................................................................................................................... 4 2.1.10 Kimmeridge Clay Formation ............................................................................................................ 4 2.1.11 Portland Group ................................................................................................................................. 4 2.1.12 Purbeck Group .................................................................................................................................. 4 2.1.13 Wealden Group ................................................................................................................................. 4 2.2 ‘Early-Upper Cretaceous’ strata .......................................................................................... 4 2.2.1 Lower Greensand Formation ................................................................................................................. 4 2.2.2 Gault Formation .................................................................................................................................... 4 2.2.3 Upper Greensand Formation ................................................................................................................. 4 2.2.4 Chalk Group .......................................................................................................................................... 4 2.3 Palaeogene strata ................................................................................................................. 6 2.3.1 London Clay Formation ........................................................................................................................ 6 2.3.2 Poole Formation .................................................................................................................................... 6 2.3.3 Branksome Sand Formation .................................................................................................................. 6 2.3.4 Creech Barrow Limestone Formation ................................................................................................... 6 3 Drift geology of the Frome-Piddle catchment ..................................................................... 7 3.1 Clay-with-flints ................................................................................................................... 7 3.2 Head .................................................................................................................................... 7 3.3 River terrace deposits .......................................................................................................... 7 3.4 Alluvium .............................................................................................................................. 7 3.5 Subsidence hollows and sink holes ..................................................................................... 7 4 Structural Framework of the Frome-Piddle Catchment ........................................................ 8 4.1 Introduction ......................................................................................................................... 8 4.2 Notes on major structures .................................................................................................... 8 4.2.1 Abbotsbury-Ridgeway Fault ................................................................................................................. 8 4.2.2 Purbeck Fault/Disturbance .................................................................................................................... 8 i 4.2.3 Litton Cheney Fault ............................................................................................................................... 8 4.2.4 Winterbourne Abbas Fault .................................................................................................................... 8 4.2.5 Watchet-Cothelstone Fault .................................................................................................................... 8 4.2.6 Compton Valence Dome ....................................................................................................................... 9 4.2.7 Wareham Basin ..................................................................................................................................... 9 5 Structure Contour Maps .................................................................................................... 10 Appendix 1 Table showing current solid lithostratigraphic terms (black) against equivalent obsolete terms (blue) used on some 1:10 000-scale maps. ................................... 11 Appendix 2 Table of boreholes used in modelling. ........................................................... 15 Appendix 3 Modelling Data Sources ................................................................................ 19 Appendix 4 Modelling methodology ...............................................................................
Load more

Recommended publications
  • Dorset & South Wiltshire
    Groundwater Situation Report Wessex (Dorset & South Wiltshire) Update 12th September 2017 Current situation Current forecast risk of groundwater flooding There are currently no groundwater flood alerts for Salisbury Plain, Cranborne Chase and the West of Dorset. The latest summary of the water situation in the South West, giving details of the rainfall, groundwater levels and river flows, can found on the GOV.UK website. The link to these pages is below: August finished much drier than it started. Overall for the month the long term average (LTA) for August was ‘normal’ at 95% LTA, 62 mm. The rivers responded well to the rainfall and most flows reflect the geographical distribution of the rainfall, drier in the north and west and wetter in the south and east. Most rivers are now ‘normal’ for the time of year though South Newton on the groundwater dominated Chalk is ‘below normal’ for the time of year. The groundwater sites show a mixed response with some groundwater sites responding to the wetter than average summer, 134% LTA, whilst others on the Chalk and Greater Oolite are still ‘notably low. Several boreholes have received significant recharge this month and were still increasing at month end others while still receding are doing so at a lower rate. Sites on the Greater Oolite and Chalk are ‘notably low’ for the time of year. Many others are ‘normal’ with the exception of Kingston Russell Road, situated in the West Dorset catchment, which was ‘notably high’. In the West of Dorset, the level at the Kingston Russell borehole, on 12/09/2017, was 105.760 metres above sea level (mAOD).
    [Show full text]
  • Back Matter (PDF)
    PROCEEDINGS OF THE YORKSHIRE GEOLOGICAL SOCIETY 309 INDEX TO VOLUME 55 General index unusual crinoid-coral association 301^ Lake District Boreholes Craven inliers, Yorkshire 241-61 Caradoc volcanoes 73-105 Chronostratigraphy Cretoxyrhinidae 111, 117 stratigraphical revision, Windermere Lithostratigraphy crinoid stems, N Devon 161-73 Supergroup 263-85 Localities crinoid-coral association 301-4 Lake District Batholith 16,73,99 Minerals crinoids, Derbiocrinus diversus Wright 205-7 Lake District Boundary Fault 16,100 New Taxa Cristatisporitis matthewsii 140-42 Lancashire Crummock Fault 15 faunal bands in Lower Coal Measures 26, Curvirimula spp. 28-9 GENERAL 27 Dale Barn Syncline 250 unusual crinoid-coral association 3Q1-A Acanthotriletes sp. 140 Dent Fault 257,263,268,279 Legburthwaite graben 91-2 acritarchs 243,305-6 Derbiocrinus diversus Wright 205-7 Leiosphaeridia spp. 157 algae Derbyshire, limestones 62 limestones late Triassic, near York 305-6 Diplichnites 102 foraminifera, algae and corals 287-300 in limestones 43-65,287-300 Diplopodichnus 102 micropalaeontology 43-65 origins of non-haptotypic palynomorphs Dumfries Basin 1,4,15,17 unusual crinoid-coral association 301-4 145,149,155-7 Dumfries Fault 16,17 Lingula 22,24 Alston Block 43-65 Dunbar-Oldhamstock Basin 131,133,139, magmatism, Lake District 73-105 Amphoracrinus gilbertsoni (Phillips 1836) 145,149 Manchester Museum, supplement to 301^1 dykes, Lake District 99 catalogue of fossils in Geology Dept. Anacoracidae 111-12 East Irish Sea Basin 1,4-7,8,10,12,13,14,15, 173-82 apatite
    [Show full text]
  • Early Cretaceous) Wessex Formation of the Isle of Wight, Southern England
    A new albanerpetontid amphibian from the Barremian (Early Cretaceous) Wessex Formation of the Isle of Wight, southern England STEVEN C. SWEETMAN and JAMES D. GARDNER Sweetman, S.C. and Gardner, J.D. 2013. A new albanerpetontid amphibian from the Barremian (Early Cretaceous) Wes− sex Formation of the Isle of Wight, southern England. Acta Palaeontologica Polonica 58 (2): 295–324. A new albanerpetontid, Wesserpeton evansae gen. et sp. nov., from the Early Cretaceous (Barremian) Wessex Formation of the Isle of Wight, southern England, is described. Wesserpeton is established on the basis of a unique combination of primitive and derived characters relating to the frontals and jaws which render it distinct from currently recognized albanerpetontid genera: Albanerpeton (Late Cretaceous to Pliocene of Europe, Early Cretaceous to Paleocene of North America and Late Cretaceous of Asia); Celtedens (Late Jurassic to Early Cretaceous of Europe); and Anoualerpeton (Middle Jurassic of Europe and Early Cretaceous of North Africa). Although Wesserpeton exhibits considerable intraspecific variation in characters pertaining to the jaws and, to a lesser extent, frontals, the new taxon differs from Celtedens in the shape of the internasal process and gross morphology of the frontals in dorsal or ventral view. It differs from Anoualerpeton in the lack of pronounced heterodonty of dentary and maxillary teeth; and in the more medial loca− tion and direction of opening of the suprapalatal pit. The new taxon cannot be referred to Albanerpeton on the basis of the morphology of the frontals. Wesserpeton currently represents the youngest record of Albanerpetontidae in Britain. Key words: Lissamphibia, Albanerpetontidae, microvertebrates, Cretaceous, Britain. Steven C.
    [Show full text]
  • X55 Weymouth - Bovington and Monkey World
    X55 Weymouth - Bovington and Monkey World First in Wessex Dorset & South Somerset Timetable valid from 25/03/2018 until further notice. Direction of stops: where shown (eg: W-bound) this is the compass direction towards which the bus is pointing when it stops Mondays to Fridays Saturdays Sundays Service Restrictions SH SH SH SH SH Weymouth, Kings Statue (Stop K5) 1050 1450 1050 1450 1050 1450 Preston, The Spice Ship (E-bound) 1100 1500 1100 1500 1100 1500 Osmington, The Sunray (E-bound) 1103 1503 1103 1503 1103 1503 Winfrith Newburgh, opp Post Office 1115 1515 1115 1515 1115 1515 West Lulworth, Durdle Door Park Entrance (E-bound) 1121 1521 1121 1521 1121 1521 Lulworth Cove, Lulworth Cove (NW-bound) 1128 1528 1128 1528 1128 1528 Wool, Wool Station (E-bound) 1141 1241 1341 1541 1641 1141 1241 1341 1541 1641 1141 1241 1341 1541 1641 Bovington Camp, Tank Museum (N-bound) 1148 1248 1348 1548 1648 1148 1248 1348 1548 1648 1148 1248 1348 1548 1648 Bovington Camp, Monkey World Car Park (S-bound) 1157 1257 1357 1557 1657 1157 1257 1357 1557 1657 1157 1257 1357 1557 1657 no service no service no service no service Service Restrictions: SH - Dorset School Holidays X55 Bovington and Monkey World - Weymouth First in Wessex Dorset & South Somerset Timetable valid from 25/03/2018 until further notice. Direction of stops: where shown (eg: W-bound) this is the compass direction towards which the bus is pointing when it stops Mondays to Fridays Saturdays Sundays Service Restrictions SH SH SH SH SH Bovington Camp, Tank Museum (N-bound) 1148 1248 1348 1548
    [Show full text]
  • Ypres Bells in Dorset
    SALISBURY DIOCESAN GUILD OF RINGERS NEWSLETTER Autumn 2017 Number 151 YPRES BELLS IN DORSET In this issue: From the 1 President Great War 1 Guild Striking 4 Competitions Open Day 5 Dean of 5 Salisbury Engagement 6 with Public Young Ringers 8 Education 11 Safeguarding 13 Calne News 15 Devizes News 16 Dorchester 18 News East Dorset Picture: Paul Tyson 19 News Marlborough 21 News Summer fun Mere News 22 Salisbury 22 News for Young West Dorset 23 News Odd bells out 24 Ringers Obituaries 25 Calendar 28 ... a young ringer on his box! Deadline for A Striking the next issue: 1 February success for 2018 Corsley [email protected] (and Wimborne too!) FACE TO FACE NEWSLETTER – AUTUMN 2017 maintenance, but, worse still, what if From the President someone is taken ill, up the tower, requiring specialist evacuation. Narrow As I look into my garden the leaves, spiral stairways make the use of most of which are glorious in their stretchers impossible so the only option autumn colours, I can hardly believe is to take them through the floor. We another year is coming to an end. By the need to engage more with the church by time you receive this edition of the Face having representation on the PCC to put to Face we will be into November and forward our concerns and get the ringers Quarter peal week with Christmas and a voice heard outside the ringing room. New Year hard on its heels. We‟ve been “sitting in our Ivory towers for too long”!! Most members of the I have not been able to attend as many public have no knowledge of what meeting and practices this year as I had happens in the ringing room, in fact hoped to but I have managed to attend many people still believe a recording of several services of rededication within bells is played.
    [Show full text]
  • Using the Solid Density to Assess Data Quality
    Materials and Structures DOI 10.1617/s11527-015-0767-3 ORIGINAL ARTICLE Porosities of building limestones: using the solid density to assess data quality Christopher Hall . Andrea Hamilton Received: 15 June 2015 / Accepted: 16 December 2015 Ó The Author(s) 2016. This article is published with open access at Springerlink.com Abstract A good knowledge of the volume-fraction the solid density should always be calculated for this porosity is essential in any technical work on porous purpose when the Archimedes method is used. This materials. In construction materials the porosity is check can be useful also when porosities are measured commonly measured by the Archimedes buoyancy by helium pycnometry or by mercury intrusion method, from which the bulk density of the test porosimetry. specimen is also obtained. The porosity and the bulk density together fix the solid density of the specimen, Keywords Porosity Á Density Á Archimedes method Á as only two of the three quantities are independent. Limestone Á Calcite The solid density, although rarely discussed, is determined by the mineralogy of the specimen, and therefore can provide a valuable check on the accuracy 1 Introduction of porosity and bulk density measurements. Our analysis of published data on calcitic limestones Most inorganic construction materials, including the shows that the solid density is generally close to the main building stones, are porous. In research on ideal crystallographic density of calcite. Small devi- mechanics, transport, and durability in these materials, ations can often be traced to variations in mineral the porosity is often used as an explanatory (indepen- composition. However some published porosity–den- dent) variable, and so it is measured and reported as a sity data are inconsistent with the known mineralogy.
    [Show full text]
  • Parish/Town Area Vacant Seats Base Expenses Expenditure Electorate
    Parish/Town Area Vacant Seats Base Expenses Expenditure Electorate Total Expenditure Grand Total per Elector per Elector Abbotsbury 4 740 £0.06 346 £20.76 £760.76 Affpuddle and Turnerspuddle 9 740 £0.06 379 £22.74 £762.74 Alderholt 9 740 £0.06 2523 £151.38 £891.38 Allington 7 740 £0.06 693 £41.58 £781.58 Alton Pancras 2 740 £0.06 132 £7.92 £747.92 Anderson 1 740 £0.06 75 £4.50 £744.50 Arne 8 740 £0.06 1098 £65.88 £805.88 Ashmore 7 740 £0.06 159 £9.54 £749.54 Athelhampton 2 740 £0.06 29 £1.74 £741.74 Batcombe 2 740 £0.06 83 £4.98 £744.98 Beaminster 11 740 £0.06 2589 £155.34 £895.34 Beer Hackett 3 740 £0.06 81 £4.86 £744.86 Bere Regis 11 740 £0.06 1346 £80.76 £820.76 Bettiscombe 2 740 £0.06 50 £3.00 £743.00 Bincombe 3 740 £0.06 78 £4.68 £744.68 Bishop`s Caundle 7 740 £0.06 329 £19.74 £759.74 Blandford Badbury Heights 1 740 £0.06 906 £54.36 £794.36 Blandford Central 6 740 £0.06 3220 £193.20 £933.20 Blandford Hilltop 2 740 £0.06 731 £43.86 £783.86 Blandford Langton St Leonards 4 740 £0.06 1604 £96.24 £836.24 Blandford Old Town 3 740 £0.06 1596 £95.76 £835.76 Blandford St Mary 7 740 £0.06 1152 £69.12 £809.12 Bothenhampton - Bothenhampton 6 740 £0.06 1299 £77.94 £817.94 Bothenhampton - Walditch 3 740 £0.06 534 £32.04 £772.04 Bourton 9 740 £0.06 707 £42.42 £782.42 Bradford Abbas 7 740 £0.06 765 £45.90 £785.90 Bradford Peverell 7 740 £0.06 323 £19.38 £759.38 Bradpole - Bradpole Village 9 740 £0.06 1712 £102.72 £842.72 Bradpole - Claremont 1 740 £0.06 243 £14.58 £754.58 Bridport North 9 740 £0.06 3541 £212.46 £952.46 Bridport South 9 740 £0.06
    [Show full text]
  • Dinosaurs British Isles
    DINOSAURS of the BRITISH ISLES Dean R. Lomax & Nobumichi Tamura Foreword by Dr Paul M. Barrett (Natural History Museum, London) Skeletal reconstructions by Scott Hartman, Jaime A. Headden & Gregory S. Paul Life and scene reconstructions by Nobumichi Tamura & James McKay CONTENTS Foreword by Dr Paul M. Barrett.............................................................................10 Foreword by the authors........................................................................................11 Acknowledgements................................................................................................12 Museum and institutional abbreviations...............................................................13 Introduction: An age-old interest..........................................................................16 What is a dinosaur?................................................................................................18 The question of birds and the ‘extinction’ of the dinosaurs..................................25 The age of dinosaurs..............................................................................................30 Taxonomy: The naming of species.......................................................................34 Dinosaur classification...........................................................................................37 Saurischian dinosaurs............................................................................................39 Theropoda............................................................................................................39
    [Show full text]
  • Bridport ED SF.Pub
    Electoral Division Profile 2017 Bridport Electoral Division Total Population: 17,800 (2015 Mid Year Estimate, DCC) Number of Electors: 14,295 (March, 2017 WDDC) Bridport Electoral Division is composed of the following parishes: Compton Valence, West Compton, Wynford Eagle, Toller Porcorum, Toller Fratrum, Burton Bradstock, Bridport, Shipton Gorge, Puncknowle, Bothenhampton, Swyre, Chilcombe, Litton Cheney, Hooke, North Poorton, Powerstock, Lodes, Allington, Askerswell and Bradpole. West Dorset West Within the division there are 2 libraries and 8 schools (7 primary and 1 secondary). Population Bridport Dorset 2015 Mid-Year Population Estimates, ONS & DCC Electoral West Dorset (DCC) Division All 17,800 100,800 420,600 % aged 0-15 years 14.7 15.6 16.0 % aged 16-64 years 52.9 55.0 56.1 % aged 65-84 years 28.0 25.0 23.8 % aged 85+ years 4.4 4.4 4.1 Bridport division has a total population of 17,800 and is represented by two councillors. The division has an older population than the County average, in particular the 65+ age group is four and half percentage points higher than for Dorset as a whole. Created by Policy & Research, Chief Executive’s Department Email: [email protected] Bridport Electoral Division, PAGE 1 Ethnicity/Country of Birth / Language spoken Dorset Census, 2011 Bridport ED West Dorset (DCC) % white British 96.3 95.7 95.5 % Black and minority ethnic groups (BME) 3.7 4.3 4.5 % England 92.4 91.3 91.0 % born rest of UK 2.8 3.1 3.4 % Rep of IRE 0.5 0.4 0.4 % EU (member countries in 2001) 1.1 1.2 1.3 % EU (Accession
    [Show full text]
  • The Team Rector Writes
    The Team Rector Writes... Dear Friends, When Bishop Nicholas visited the deaneries of the Diocese during Lent 2015 to develop our conversation around the vision RENEWING HOPE – PRAY, SERVE, GROW, he challenged us with three questions: What do you pray for? Whom do we serve? How will you grow? Questions that might at a first glance seem easy to answer: I want to encourage you to take time this Advent to look at those questions and allow yourselves to be more challenged than you expect! Advent and Christmas are seasons for the renewing of hope and I wonder whether we might try sharing our stories of hope with each other, as we seek to tell the greatest story of hope? At the start of diocesan meetings we now spend time sharing our stories of hope, talking about the things that have given us hope recently. First a candle is lit as the centre of the meeting – symbol of Christ’s presence in our midst; the Bible is read and studied; then people tell one another their stories. Simple but profound and challenging too! It is easy to be busy and preoccupied by the needs and demands of the day, especially in preparation for Christmas! But how life giving and holy it is to seek out and name those moments when hope has erupted. For some Christmas is unbounded joy and excitement, for others it is painful and troubling. However, it is the moment when we reflect on the truth that God became a human being; forever to experience our joys and sorrows alongside us.
    [Show full text]
  • Mineral Resources Report for Wiltshire
    Mineral Resource Information in Support of National, Regional and Local Planning Wiltshire (comprising Wiltshire and the Borough of Swindon) Commissioned Report CR/04/049N BRITISH GEOLOGICAL SURVEY COMMISSIONED REPORT CR/04/049N Mineral Resource Information in Support of National, Regional and Local Planning Wiltshire (comprising Wiltshire and the Borough of Swindon) G E Norton, D G Cameron, A J Bloodworth, D J Evans, G K Lott, I J Wilkinson, H F Burke, N A Spencer, and D E Highley This report accompanies the 1;100 000 scale map: Wiltshire (comprising Wiltshire and the Borough of Swindon) Mineral Resources Key words Mineral resource planning, Wiltshire, Swindon. Front cover Westbury Cement Works, Lafarge Cement UK (Blue Circle Cements), and Westbury White Horse. Bibliographical reference G E NORTON, D G CAMERON, A J BLOODWORTH, D J EVANS, G K LOTT, I J WILKINSON, H F BURKE, N A SPENCER, and D E HIGHLEY. 2004. Mineral Resource Information in Support of National, Regional and Local Planning. Wiltshire (comprising Wiltshire and the Borough of Swindon) British Geological Survey Commissioned Report, CR/04/049N. 12pp. Keyworth, Nottingham British Geological Survey 2004 BRITISH GEOLOGICAL SURVEY The full range of Survey publications is available from the British Geological Survey offices BGS Sales Desks at Nottingham, Edinburgh and London; see contact details below or shop online at Keyworth, Nottingham NG12 5GG www.geologyshop.com 0115B936 3100......................... Fax 0115B936 3200 e-mail: sales @bgs.ac.uk The London Information Office also maintains a reference www.bgs.ac.uk collection of BGS publications including maps for Online shop: www.geologyshop.com consultation.
    [Show full text]
  • The Giant Pliosaurid That Wasn't—Revising the Marine Reptiles From
    The giant pliosaurid that wasn’t—revising the marine reptiles from the Kimmeridgian, Upper Jurassic, of Krzyżanowice, Poland DANIEL MADZIA, TOMASZ SZCZYGIELSKI, and ANDRZEJ S. WOLNIEWICZ Madzia, D., Szczygielski, T., and Wolniewicz, A.S. 2021. The giant pliosaurid that wasn’t—revising the marine reptiles from the Kimmeridgian, Upper Jurassic, of Krzyżanowice, Poland. Acta Palaeontologica Polonica 66 (1): 99–129. Marine reptiles from the Upper Jurassic of Central Europe are rare and often fragmentary, which hinders their precise taxonomic identification and their placement in a palaeobiogeographic context. Recent fieldwork in the Kimmeridgian of Krzyżanowice, Poland, a locality known from turtle remains originally discovered in the 1960s, has reportedly provided additional fossils thought to indicate the presence of a more diverse marine reptile assemblage, including giant pliosaurids, plesiosauroids, and thalattosuchians. Based on its taxonomic composition, the marine tetrapod fauna from Krzyżanowice was argued to represent part of the “Matyja-Wierzbowski Line”—a newly proposed palaeobiogeographic belt comprising faunal components transitional between those of the Boreal and Mediterranean marine provinces. Here, we provide a de- tailed re-description of the marine reptile material from Krzyżanowice and reassess its taxonomy. The turtle remains are proposed to represent a “plesiochelyid” thalassochelydian (Craspedochelys? sp.) and the plesiosauroid vertebral centrum likely belongs to a cryptoclidid. However, qualitative assessment and quantitative analysis of the jaws originally referred to the colossal pliosaurid Pliosaurus clearly demonstrate a metriorhynchid thalattosuchian affinity. Furthermore, these me- triorhynchid jaws were likely found at a different, currently indeterminate, locality. A tooth crown previously identified as belonging to the thalattosuchian Machimosaurus is here considered to represent an indeterminate vertebrate.
    [Show full text]