DOCSLIB.ORG

The Geology Durdle Door, Dorset Chalk Stratigraphy, Sedimentology and Tectonic Structure New Marker Beds

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Geology Durdle Door, Dorset Chalk Stratigraphy, Sedimentology and Tectonic Structure New Marker Beds Wessex OUGS Field Guide to Durdle Door, Dorset, May 2018 The Geology Durdle Door, Dorset Chalk stratigraphy, sedimentology and tectonic structure New marker beds Durdle Cove, Dorset looking west over Scratchy Bottom and Swyre Head to Bat’s Head. The line of caves at the foot of the cliff in Durdle Cove is formed on the Durdle Cove Thrust (see also Rowe 1901, Plate III, pp. 16-17). Open University Geological Society Wessex Group Field Excursion Sunday 13th May 2018 Leaders: Rory Mortimore and Jeremy Cranmer Field guide prepared by Rory Mortimore www.chalkrock.com Based on the paper Late Cretaceous stratigraphy, sediments and structure: gems of the Jurassic Coast of Devon and Dorset, England just going into press in the Proceedings of the Geologists’ Association, 2018. 1 Wessex OUGS Field Guide to Durdle Door, Dorset, May 2018 Wessex OUGS Field Trip Durdle Door, Durdle Cove, Scratchy Bottom and Bat’s Head Late Cretaceous stratigraphy, sediments and structure: gems of the Jurassic Coast of Devon and Dorset, England Introduction Extraordinary, long-distance litho-marker beds such as the Lewes and Shoreham Tubular Flints and associated marl seams and fossils (Fig.2), recognised in cliff exposures and cliff-fall boulders, are keys to unlocking the stratigraphy and tectonic structures in the Late Cretaceous (Fig.1) of the Jurassic Heritage Coast. Durdle Cove is a special gem exposing the Lewes and Seaford Chalk stratigraphy where these and new marker beds are identified and where sediments and tectonic structures provide clues to timing of movements that produced a Late Cretaceous pericline which grew into a Miocene monocline along the line of the underlying Purbeck Reverse Fault. During ‘inversion’ along this fault (Fig.4) some Late Cretaceous Chalk formations were in part or completely ‘lost’ (e.g. Middle Turonian New Pit Chalk Formation) and others were condensed (e.g. Late Santonian and Early Campanian Newhaven Chalk Formation). Other features of this section include the presence of the very large bivalve fossil Platyceramus sp. which provides clues to Chalk sea-floor environments. Figure 1. Cretaceous (D’Halloy, 1822) series and stages after Birkelund (1984) Although much of Britain was covered by a shallow shelf sea during the Late Cretaceous, Wessex, including the Jurassic Coast, provided shallower conditions than the main basinal areas to the east. A rich, shelly, shelf-fauna especially in the Albian, Cenomanian and Early Turonian provides many 2 Wessex OUGS Field Guide to Durdle Door, Dorset, May 2018 palaeontological gems including ammonites rarely preserved in more basinal areas associated with a rich diversity and abundance of echinoids and brachiopods in highly condensed successions. Figure 2. Stratigraphical position of South Dorset and Durdle Door Upper Cretaceous Chalk sections in relation to the standard ‘basinal’ stratigraphical column in the Wessex Basin and eastwards. A special Cretaceous gem of the Jurassic Coast is the spectacularly folded Chalk forming the Ridgeway and Purbeck Hills in south Dorset within which there is a history of tectonic movements spanning the Jurassic to Cenozoic (e.g. Underhill and Patterson 1998). The spine of this folding is located in the near vertical to overturned bedding seen in all the bays from Ballard Point through Worbarrow and Mupe Bay to Lulworth Cove and Durdle Cove. Within the folded Chalk the smaller- scale structures, especially the thrusts and inclined shear fractures, have been the subject of several studies. Arkell (1936, 1938, 1947), classified the fractures in the Chalk into seven groups and these were given a genetic interpretation related to the evolution of the Purbeck fold by Phillips (1964). 3 Wessex OUGS Field Guide to Durdle Door, Dorset, May 2018 However, Bevan (1985) and latterly House (1989, 1993), recognised that the Arkell classification and Phillips’ interpretation was over-complicated as the conjugate, inclined fractures probably predated the monoclinal folding having formed through bedding-slip during the Late Cretaceous and then been rotated into their present position during later Cenozoic folding. These structures are comparable to similar fractures and subsequent rotation in folds seen in Sussex and elsewhere (Mortimore, 2011). Further studies of the meso-fractures and faults (Ameen, 1990; Ameen and Cosgrove, 1990) have emphasised the origins of the Purbeck fold as a ‘forced’ anticline due to uplift over the Purbeck Reverse Fault causing folding in the ‘cover’ rocks (Fig. 3). They also illustrated that the famous Ballard Head Thrust Fault (e.g. Rowe, 1901 Photo Plate VIII), formed prior to the main monoclinal folding as a thrust ramp structure which has itself been subsequently folded in the monocline (Ameen and Cosgrove, 1990, 1991). Figure 3. Map showing the broadly east-west line of faults (Purbeck, Needles, and Sandown faults) which underlie the steeply dipping north monoclonal folds and along which inversions from pre- Gault-Greensand (Albian mid-Cretaceous) basins and highs (Portland-Wight Basin and Hampshire- Dieppe High) became the Portland Wight High and Hampsire Basin in the Late Cretaceous – Cenozoic. Based on Chadwick and Evans 2005. LC=Lulworth Cove WB=Worbarrow Bay 2. Albian – Cenomanian Gault, Greensands and Grey Chalk palaeogeography Within the narrow strip of Gault, Upper Greensand and Grey Chalk coastal exposures in Dorset between Punfield Cove in the east and Lulworth Cove in the west is a remarkable change in lithologies and thicknesses of these deposits . These lateral changes, recognised by Strahan (1895, 1898), have been investigated in detail (Tresise, 1960, 1961; Drummond, 1967, 1970) and the causes related to a contemporaneous tectonic structure between Mupe Bay and Lulworth Cove. A parallel study in inland Dorset, showing similar lateral variations from east to west, has led to the idea of a tectonically controlled Mid-Dorset Swell between a Wessex shelf further to the west and a basin to the east (Drummond, 1967, 1970; Kennedy, 1970; Bristow et al., 1995; Gallois, 2004). House (1989, p. 99) considered that east-west growth faults were a more likely cause of the lateral changes including thinning in the sediments (see also discussion in Hart, 1994). Whichever interpretation is correct the stratigraphic and sedimentary complexity creates a special, multifaceted-geological-gem, which requires detailed centimetre by centimetre analyses to fully unravel. Latterly, Gallois and Owen (2018) have provided detailed measured field sections illustrating the stratigraphy and lithology of the Albian Gault and Upper Greensand in the Jurassic Coast. A special feature of the South Dorset coastal area is the presence of an extensive hardground, mineralised with calcite, green galuconite and orange iron staining at the boundary between the Albian Upper 4 Wessex OUGS Field Guide to Durdle Door, Dorset, May 2018 Greensand and the Cenomanian Grey Chalk (simultaneously the boundary between Early and Late Cretaceous series, Fig.1). This Worbarrow Bay Hardground (Fig. 4), contains extensive Thalassinoides burrow networks . In many places, bioerosion has reduced the top layer of this hardground to a rubble of bored and mineralised nodules in a silty glauconitic matrix. Figure 4. Durdle Cove section 1 Albian Upper Greensand, Cenomanian Grey Chalk, Plenus Marls and basal Melbourn Rock and Turonian Holywell Nodular Chalk with the Grit Beds. 3. Cenomanian Grey Chalk from basin to shelf and rare fossils The relatively simple Grey Chalk succession in the Wessex Basin and its extension into the Wealden area with two formations (West Melbury Marly Chalk and Zig Zag Chalk formations, Fig.2) becomes highly complex in the condensed, marginal facies of the Wessex Shelf. What makes the highly condensed sections of the shelf a particular Cretaceous ‘gem’ of the Jurassic coast is the abundance and richness of a diverse fauna and the preservation of otherwise rare ammonites, especially the key index ammonites of the Late Cenomanian (Neocardioceras juddii ) and the Early Turonian (Watinoceras devonense (Wright and Kennedy)) on top of the Haven Cliff Hardground in southeast Devon (Wright and Kennedy, 1981). The diversity of echinoids and brachiopods in a shelly, shelf fauna within a gritty sandy matrix has made field sections at Seaton Hole and Wilmington Sand Pit famous. In other exposures along the Dorset coast such as Worbarrow Bay and White Nothe much of the information comes from cliff-fall boulders. 4. Late Turonian and Early Coniacian Lewes Nodular Chalk Formation Like the Holywell Nodular Chalk the nodularity and hardground development in the Lewes Nodular Chalk increases/strengthens westwards from Sussex-Hampshire into south Dorset and southeast Devon. Such lithological development probably relates to extensive submarine winnowing and erosion across the relatively shallower seas of the Wessex Shelf. Despite the condensed sections and increased nodularity many of the key marker beds including marl seams, flint bands, hardgrounds, 5 Wessex OUGS Field Guide to Durdle Door, Dorset, May 2018 trace fossils and fossil abundance horizons can be recognised in south Dorset and southeast Devon (Figs. 6-18.). A particularly well developed mineralised phosphatic hardground present in Durdle Cove at the entrance to Scratchy Bottom is named the Durdle Door Hardground (Figs. 15 and 18). With more research it may be possible to correlate the Durdle Door Hardground with the Sussex succession (possibly the Hope Gap Hardground) as both hardgrounds are associated with
Load more

Recommended publications
  • The Stones of Osterley Park House Ruth Siddall
    Urban Geology in London No. 37 The Stones of Osterley Park House Ruth Siddall Osterley Park House was designed and built by Robert Adam (1728-1792) in the late 18th Century, between 1761 and the 1780s. It was commissioned by the Child Family and superseded a Tudor Mansion on the same site. Adam had ‘total design’ control of the construction and interior decoration of the house. This assumes that Adam also had a hand in overseeing if not selecting the building materials used. This brief report summarises the building and decorative stones used in the building, as observed following a visit to Osterley Park House in June 2017. Portico and Courtyard Portland Whitbed is used for the pediment, balustrade, quoins and other stone dressings on the exterior of Osterley Park House. It is also used for paving and for the columns supporting the pediment. This stone is identified by the pale grey colour with darker fossilised shells of oysters, which now weather slightly proud of the surface. Sedimentary bedding alignment can be detected in both columns and in some flagstones due to the concentration of shell beds. Portland Whitbed is the most commonly used of three main building stones extracted from the Portland Limestone Formation which occurs in outcrop and subcrop on the Isle of Portland, a peninsula on the Dorset Coast. Whitbed contains variable fossil content, predominantly in the form of oyster shells with well-preserved, laminated shells and also fragments of the reef-forming algae Solenpora portlandica. Two other units are also extracted as building stone; the Basebed and the Roach.
    [Show full text]
  • A Fragment of the Geography of England. South West Sussex Author(S): Hugh Robert Mill Source: the Geographical Journal, Vol
    A Fragment of the Geography of England. South West Sussex Author(s): Hugh Robert Mill Source: The Geographical Journal, Vol. 15, No. 3 (Mar., 1900), pp. 205-227 Published by: geographicalj Stable URL: http://www.jstor.org/stable/1774689 Accessed: 27-06-2016 19:49 UTC Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at http://about.jstor.org/terms JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. The Royal Geographical Society (with the Institute of British Geographers), Wiley are collaborating with JSTOR to digitize, preserve and extend access to The Geographical Journal This content downloaded from 165.193.178.102 on Mon, 27 Jun 2016 19:49:48 UTC All use subject to http://about.jstor.org/terms The Geographical Journal. No. 3. MARPCH, 1900. VOL. XV. A FRAGMENT OF THE GEOGRAPHY OF ENGLAND. SOUTH WEST SUSSEX.' By HUGH ROBERT MILL, D.Sc., F.R.S.E. Introductory.-In 1896 I proposed a scheme for a geographical description of the United Kingdom, based on the maps of the Ordnance Survey, and consisting of a separate memoir for every sheet of the map on the scale of 1 inch to a mile.t I was requested by the Royal Geographical Society to prepare a specimen memoir, and, by the advice of Sir John Farquharson, then Director-General of the Ordnance Survey, chose Sheet No.
    [Show full text]
  • The Spinneys Studland • Dorset the Spinneys Swanage Road • Studland • Swanage • Dorset • BH19 3AE
    The Spinneys Studland • Dorset The Spinneys Swanage Road • Studland • Swanage • Dorset • BH19 3AE Beautifully presented split level house in this sought after coastal location Accommodation Reception Hall • Sitting Room • Dining Room • Kitchen • Second Sitting Room Master Bedroom with En Suite Bathroom • Three further Bedrooms • Family Bathroom Integral Double Garage SaviIls Wimborne Wessex House, Wimborne Dorset, BH21 1PB [email protected] 01202 856800 Situation There is also a railway station at nearby Wareham with a a shower room with WC and an additional sitting room also The Spinneys is located on the outskirts of the immensely service between Weymouth and London as well as the with access to the rear garden. On the first floor are four popular seaside village of Studland with amenities including Heritage Railway link to the coastal resort of Swanage. bedrooms, the master bedroom and bedroom two having a post office, shop, public house, the well regarded Pig on lovely views out over the delightful front gardens and Ballard the Beach and of course easy access to sandy beaches and Description Down beyond. the sea offering excellent water sport opportunities. Nearby The Spinneys is a beautifully presented detached split level Accommodation towns include Swanage and Wareham, both of which offer village house with part rendered and stone elevations under a Please see floor plans. a good variety of shopping, educational and recreational tiled roof. The property was constructed about 30 years ago facilities. Sporting facilities include nearby golf courses at the for the present owners and has been maintained to a high Outside Isle of Purbeck Golf Club and the Dorset Golf & Country Club standard and is set within a large plot with both front and rear The property is approached from the village road via a tarmac and walking along the Dorset Jurassic Coastline a UNESCO gardens.
    [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]
  • Greensand.Pdf
    www.natureswayresources.com GREENSAND Greensand is a naturallyoccurring mineral mined from ocean deposits from a sedimentary rock known as “Glauconite”. It is often an olive-green colored sandstonerock found in layers in many sedimentary rock formations. Origin of Greensand Greensand forms in anoxic (without oxygen) marine environments that are rich in organic detritus and low in sedimentary inputs. Some greensands contain marine fossils (i.e. New Jersey Greensand). Greensand has been found in deposits all over the world. The greenish color comes from the mineral glauconite and iron potassiumsilicate that weathers and breaks down releasing the stored minerals. The color may range from a dark greenish gray, green-black to blue-green dependingon the minerals and water content. It often weatherseasilyand forms nodules that have been oxidized with iron bearing minerals that has a reddish brown or rust color. +3 The major chemical description is ((K,Na)(Fe , Al, Mg)2(Si,Al)4O10(OH)2) General chemical information: Iron (Fe) 12-19% Potassium (K) 5-7 % Silicon (Si) 25.0% Oxygen (O) 45% Magnesium (Mg) 2-3 % Aluminum (Al) 1.9 % Sodium (Na) 0.27% Hydrogen (H) 0.47% Over 30 other trace minerals and many micronutrients. Types of Greensand Glauconite is the namegiven to a group of naturally occurring iron rich silica minerals that may be composed of pellets or grains. When glauconite is mined the upper layers that have weathered and become oxidizedand minerals are released.These sometimes form pyrite a iron sulfide (FeS2) when oxygen is www.natureswayresources.com absent. In the deeper layers or reduced zone pyrite crystals often form.
    [Show full text]
  • Hydrogeological Field Guide to the Wessex Basin
    Hydrogeological Field Guide to the Wessex Basin Technical Report IR/00/77 R Tyler-Whittle, P Shand, K J Griffiths and W M Edmunds This page is blank BRITISH GEOLOGICAL SURVEY Natural Environment Research Council TECHNICAL REPORT IR/00/77 Hydrogeology Series Technical Report IR/00/77 Hydrogeological Field Guide to the Wessex Basin R Tyler-Whittle, P Shand, K J Griffiths and W M Edmunds This report was prepared for an EU BASELINE fieldtrip. Bibliographic Reference Tyler-Whittle R, Shand P, Griffiths K J and Edmunds W M, 2000 Hydrogeological Field Guide to the Wessex Basin British Geological Survey Report IR/00/77 NERC copyright 2000 British Geological Survey Keyworth, Nottinghamshire BRITISH GEOLOGICAL SURVEY BRITISH GEOLOGICAL SURVEY KEYWORTH NOTTINGHAM NG12 5GG UNITED KINGDOM TEL (0115) 9363100 FAX (0115) 9363200 DOCUMENT TITLE AND AUTHOR LIST Hydrogeological Field Guide to the Wessex Basin R Tyler-Whittle, P Shand, K J Griffiths and W M Edmunds CLIENT CLIENT REPORT # BGS REPORT# IR/00/77 CLIENT CONTRACT REF BGS PROJECT CODE CLASSIFICATION Restricted SIGNATURE DATE SIGNATURE DATE PREPARED BY CO-AUTHOR (Lead Author) CO-AUTHOR CO-AUTHOR PEER REVIEWED BY CO-AUTHOR CHECKED BY CO-AUTHOR (Project Manager or deputy) CO-AUTHOR APPROVED BY CO-AUTHOR (Project Director or senior staff) CO-AUTHOR APPROVED BY OS Copyright (Hydrogeology acknowledged Group Manager) Assistant Director Layout checked by clearance (if reqd) BRITISH GEOLOGICAL SURVEY The full range of Survey publications is available from Keyworth, Nottingham NG12 5GG the BGS Sales Desk at the Survey headquarters, ☎ 0115-936 3100 Telex 378173 BGSKEY G Keyworth, Nottingham. The more popular maps and Fax 0115-936 3200 books may be purchased from BGS-approved stockists Murchison House, West Mains Road, Edinburgh, EH9 3LA and agents and over the counter at the Bookshop, Gallery ☎ 37, Natural History Museum, Cromwell Road, (Earth 0131-667 1000 Telex 727343 SEISED G Fax 0131-668 2683 Galleries), London.
    [Show full text]
  • 5-Night Dorset Coast Christmas & New Year Guided
    5-Night Dorset Coast Christmas & New Year Guided Walking Holiday Tour Style: Guided Walking Destinations: Dorset Coast & England Trip code: LHXFW-5 2 & 3 HOLIDAY OVERVIEW The Dorset Coast is beautiful all year round but there are some even more spectacular sights around winter. Spend the festive season on the Dorset Coast, socialising and walking in this beautiful place. There’s something magical about walking in winter. Whether it’s the frosty footsteps, the clear crisp air, or the breathtaking views, it’s a wonderful time to go walking. Join our festive breaks and choose from a guided walking holiday in the company of one of our knowledgeable leaders. We pull out all the stops on our festive holidays, with fabulous food, lots of seasonal entertainment and great walks and activities. The walks are tailored to the time of year and will remain flexible to suit the weather conditions. Each day three grades of walk will be offered. So wrap up warm, lace up your boots and go for an invigorating walk. WHAT'S INCLUDED • Wonderful meals – full selection at breakfast, your choice of picnic lunch, an excellent evening meal and plenty of festive treats • A programme of organised walks and activities www.hfholidays.co.uk PAGE 1 [email protected] Tel: +44(0) 20 3974 8865 • The services of experienced HF Holidays’ guides • A packed programme of evening activities offering something festive for everyone, including some old HF favourites • Any transport to and from the walks HOLIDAYS HIGHLIGHTS • Enjoy Christmas or New Year at our new Country House at Lulworth Cove • Plenty of exercise to walk off the festive excesses • A choice of guided walks along the spectacular Dorset Coast • Just relax, soak up the party atmosphere, enjoy wonderful festive fare and leave all the organising to us • Evening activities include dancing, quizzes and carol evenings TRIP SUITABILITY The walks are tailored to the time of year and will remain flexible to suit the weather conditions.
    [Show full text]
  • South West Coast Path : Weymouth to Lulworth Cove Walk
    Saturday Walkers Club www.walkingclub.org.uk South West Coast Path : Weymouth to Lulworth Cove walk Weymouth Bay, then a dramatic cliff walk past small beaches, then higher cliffs past Durdle Door (stack) to Lulworth Cove Length 11.1 miles / 17.8 km Toughness 8 out of 10 - 2,400 feet / 730m of ascent (lots of small climbs) Features This spectacular coast walk follows the waymarked South West Coastal Path (SWCP) / England Coast Path (ECP) from Weymouth (seaside town with picturesque harbour) along its seafront promenade, then over spectacular cliffs and past secluded coves and beaches towards Durdle Door (stack) and Lulworth Cove. All, with views over Weymouth Bay and the Isle of Portland. The start is gentle - along the seafront then seawall. Then over a small hill (pub, cafe, both with sea views) to Bowleaze Cove with its spectacular art deco hotel. Then past some small beaches to the Smugglers Inn in Osmington for lunch. After lunch the cliff top path continues on past Ringstead and above Burning Cliff beach (the fire went out in in 19th C). It passes St Catherine-by- the-Sea church (nice picnic spot), and then becomes an undulating cliff edge walk (a more level inland option is available) to Durdle Door (a stack, great beach) before descending to Lulworth Cove. Return to Wool Station by bus (summer only) or taxi This walk can also be done in reverse, indeed transport considerations may may that a better option. In this case, take a bus from Wool to Lulworth Cove. At the end, continue along the coast to Weymouth's Historic Harbour area which is much nicer than the tacky seafront next to the train station https://www.walkingclub.org.uk/walk/weymouth-to-lulworth-cove/ 1/6 You hardly need a map for this walk as the SWCP is very well waymarked, and you are just following the coast, but it is useful to check your progress.
    [Show full text]
  • Natural Hydraulic Fractures in the Wessex Basin, SW England: Widespread Distribution, Composition and History Alain Zanella, Peter Robert Cobbold, Tony Boassen
    Natural hydraulic fractures in the Wessex Basin, SW England: widespread distribution, composition and history Alain Zanella, Peter Robert Cobbold, Tony Boassen To cite this version: Alain Zanella, Peter Robert Cobbold, Tony Boassen. Natural hydraulic fractures in the Wessex Basin, SW England: widespread distribution, composition and history. Marine and Petroleum Geology, Elsevier, 2015, 68 (Part A), pp.438-448. 10.1016/j.marpetgeo.2015.09.005. insu-01200780 HAL Id: insu-01200780 https://hal-insu.archives-ouvertes.fr/insu-01200780 Submitted on 18 Sep 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. ACCEPTED MANUSCRIPT Natural hydraulic fractures in the Wessex Basin, SW England: widespread distribution, composition and history A. Zanella 1, 2 *, P.R. Cobbold 1 and T. Boassen 4 1Géosciences-Rennes (UMR-6118), CNRS et Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France 2L.P.G., CNRS UMR 6112, Université du Maine, Faculté des Sciences, 72085 Le Mans Cedex 9, France 4 Statoil ASA Research Centre, NO-7005 Trondheim, Norway *Corresponding author, e-mail: [email protected] Abstract Bedding-parallel veins of fibrous calcite ('beef') are historical in the Wessex Basin.
    [Show full text]
  • Signalling and Beacon Sites in Dorset
    THE DORSET DIGGER THE NEWSLETTER OF THE DORSET DIGGERS COMMUNITY ARCHAEOLOGY GROUP No 43 December 2016 Signalling and Beacon Sites in Dorset Richard Hood has kicked off this new project. He needs somemorevolunteerstohelpwith the research Introduction The ability to send or receive a message over a distance to warn of impending attack has been used to mobilise troops for defence since the Roman times. The Romans developed a system using five flags or torches to carry a simple message over short distances. This was usually used in battle to pass information out to army commanders. To carry a simple message further, a bonfire was used set on a high point, usually from a mini fort within vision of one or more other sites. This type of warning system was used during the invasion of Britain, when vexation forts could come under attack from tribes yet to be persuaded of the advantages of Roman living. Near the end of the Roman occupation signal stations were employed on the East and South coasts to warn of Saxon pirates. Roman signal stations on the NE coast of England took the form of mini forts, with a ditch and bank for defence. Black Down in Dorset, excavated by Bill Putnam and re examined by Dorset Diggers in 2016 is of this type. The Saxons appear to have had a system of inter divisible beacon sites to warn of Viking attack from the ninth century onwards. Later, beacons were erected to warn of the approach of the Spanish Armada, followed by a similar, but unused system, to warn of Napoleonic invasion.
    [Show full text]
  • Greensand (Glauconite)
    Greensand (Glauconite) PAR4® Greensand is a naturally occurring iron-potassium silicate also known as glauconite that provides potassium, iron, and silicon. PREMIUM PRODUCT PAR4® Greensand is not a fertilizer. It is a soil conditioner that loosens and opens tight soils, helps bind sandy soils, contributes to moisture retention and stimulates soil microbe activity. Field studies show that plant-available Silicon can suppress plant stress and disease and reduce insect attack. The Association of American Plant Food Control Official recognizes Silicon as beneficial for plants. ENVIRONMENTALLY FRIENDLY Remineralizing the soil by using trace mineral products such as PAR4® Greensand, feeds soil microbe populations. Greensand has a long history of use in sustainable agriculture. EASY TO APPLY PAR4® Greensand flows like sand. With any mined mineral, the finer the grind the more rapidly the nutrients can be utilized by a plant. Over 70% of PAR4® Greensand passes through no.100 screen. It can be applied through conventional spreaders, seeders, or drills. PAR4® Greensand can be incorporated into soil mixes for use in nurseries and indoor growing. Always perform a soil test prior to applying any fertilizer, soil amendment or conditioning product. FLEXIBLE PACKAGING AND PERSONALIZED SERVICE Packaging options include 50 lb. bags and bulk bags, available in truckload and pallet quantities. Pallet lots are available from our warehouse in Stockton, CA. With Bridgewell’s personalized service, you can be assured that PAR4® Greensand gets to you when you
    [Show full text]