(updated 26th October 2009)

A list of glacial erratics found on field meetings of the Hull Geological Society or records contributed by members and friends.

This list was compiled by Mike Horne from fieldwork, with additional data contributed by Brenda Almond, Geoff Featherstone, Gordon Ostler, Harold Tabiner, Ian Heppenstall, Nigel Whittington, Patty McAlpin, Richard Middleton, Rod Towse, Simon Kitcher, Stuart Jones, Terry Rockett and Tony Barker.

The sites are arranged alphabetically. There are different lists for material recorded in the boulder clay cliffs, beach exposures and loose on the beach. The specimens recorded were seen loose on the beach unless otherwise specified. Some sites in Norfolk and North Yorkshire have been included for comparison.

Aldbrough - Asteroceras, Belemnitella mucronata, Gryphaea, Exogyra, Cardinia [large Scunthorpe type].

Aldbrough (south) - pink granite, Lithostrotian in brown limestone, septarian nodule, Harpoceras, Gryphaea, Gryphaea gigantia, Pentacrinus.

Barmston - Gryphaea, Exogyra, Pleuromya, jasper, pegmatite.

Carnelian Bay - basalt, carnelian.

Carnelian Bay (north to middle) - jasper, yellow quartz, , pale crinoidal Carboniferous Limestone, white quartz, red Cheviot Porphyry, black Cheviot Porphyry, Lithostrotian, Gryphaea, carnelian, Tilberthwaite Tuff, basalt, Magnesian Limestone, green jasper, red rhomb porphyry, Cardinia, corals in red Carboniferous Limestone, pink granite, jet, coal, Pentacrinus, dogger, grey granite, coal, jet, Harpoceras, Gigantoproductus, Jurassic rootlet bed, Jurassic shelly limestone, Old Red Sandstone, New Red Sandstone, Shap Granite, Dactylioceras, Larvikite, Brockram, grey rhomb porphyry, garnet mica schist. NOTE - also found - chalk, grey flint, Inoceramus in grey flint [probably part of cliff defenses].

Carnelian Bay southern end - jasper, Gryphaea, Gryphaea gigantia, carnelian, white quartz, Lithostrotian, Lithostrotian in red limestone, rippled brown sandstone, coarse brown gritstone, gneiss, schist, black shelly Carboniferous Limestone, Cheviot Porphyry, septarian nodule, Jurassic shelly limestone, Cardinia, D. commune, Frosterly Marble, Pentacrinus, pink granite, mica schist, black Cheviot Porphyry, Brockram, coarse rhomb porphyry, green conglomerate, crinoidal Carboniferous Limestone, Larvikite, coal.

Cayton Bay northern end - granite, dolerite, Gryphaea, Scandinavian porphyry, New Red Sandstone, crinoidal Carboniferous Limestone, white quartz, jet, coal, Jurassic rootlet bed, yellow quartz, Brockram, Liassic shell bed, Jasper, dark grey flint, black Cheviot porphyry, carnelian, "beef".

Cowden - Endemoceras

Danes Dyke - Brockram, gneiss.

Dimlington (north to large concrete blocks on beach) loose on beach - rhomb porphyry, Gryphaea in grey limestone (not found as separate specimens), grey shelly Jurassic limestone, Lithostrotion, Cardinia, black flint, jasper,Brockram, basalt, pale brown sandstone, Larvikite, Productus in Carboniferous Limestone, Old Red Sandstone, gneiss.

Dimlington (in front of the gas terminals, going north as short distance) - Lithostrotian, Gryphaea in limestone, dogger, jasper, gneiss, Norwegian rhomb porphyry, yellow quartz, black flint, Jurassic rootlet bed, crinoidal Carboniferous Limestone, fossil wood, Gryphaea.

Easington (going north) - black flint, Chalk, Lower Jurassic shelly limestone, Lithostotian, Carboniferous Limestone, Old Red Sandstone, grey flint. granite, white flint, coarse brown sandstone, pyrite, jasper, white quartz, black rhomb porphyry, green conglomerate, Gigantoproductus in Carboniferous Limestone, yellow quartz, New Red Sandstone, carnelian [and Larvikite from the Dimlington sea defenses]

Easington - Gryphaea, Exogyra, Larvikite, red granite, grey granite, carnelian, quartz, crinoid in Carboniferous Limestone.

Easington (south) in situ cliff exposure - chalk, black flint (common), yellow quartz, pink chalk, rhomb porphyry, black shale, belemnite, pink granite, Lithostrotian in yellow limestone, grey flint.

Easington (south) - jasper, yellow quartz, grey flint, pink chalk, septarian nodule, white quartz, Frosterly Marble, red rhomb porphyry, Lithostrotian, dogger in orange sandstone, black flint, grey granite, brown sandstone, dolerite, garnet schist, Brockram, Jurassic plant bed, Jurassic shelly limestone, chalk, grey sandstone, coarse orange sandstone, New Red Sandstone.

Fraisthorpe - very large Micraster in black flint.

Happisburgh (Norfolk; TG364312) - Cardium, yellow quartz, red sandstone, black flint (common), septarian nodule, brown sandstone, brown quartzite, red quartzite, ironstone (common), Old Red Sandstone, small chalk pebbles and streaks, jasper, white quartz, clear quartz.

Holme-on-Spalding Moor (Vale of York; Church Hill) - yellow quartz, chalk, sandstone, white quartz, grey flint, jasper, Whin Sill, brown flint, black flint, ironstone, brown sandstone, coarse brown sandstone, ?Cheviot Porphyry, Jurassic Oolite, yellow flint.

Hornsea (central - in front of the promenade) on the beach - black flint, Inoceramus in black flint, yellow quartz, yellow sandstone, New Red Sandstone, chalk, green conglomerate, gneiss, Jurassic Shelly Limestone, red flint, granite, jasper, red microgranite, Old Red Sandstone, muscovite schist, white quartz, Jurassic rootlet bed, Larvikite, grey flint, Tilberthwaite Tuff, Lithostrotian, rhomb porphyry, black shelly Carboniferous Limestone, carnelian, septarian nodule, carnelian, Brockram, Frosterly Marble, rhomb porphyry, Cheviot porphyry, pink granite.

Hornsea (south) in situ in the cliff - chalk, coal, red chalk, pink chalk, yellow quartz, brown sandstone, New Red Sandstone, brown gritstone, Kimmeridge Clay, jasper, Gryphaea, white quartz, grey flint, basalt, black flint, dolerite, quartzite, septarian nodule, gneiss, greensand, Deltaic Sandstone, rhomb porphyry, rafts of soft chalk, granite, Lithostrotian, agate, Hibolites, Jurassic belemnite, Jurassic shelly limestone, Jurassic rootlet bed, quartz conglomerate with red matrix, pyrite, brown flint, Old Red Sandstone, Lias cementstone, brown sandstone, grey sandstone, yellow sandstone, green conglomerate, chalk pebble bored by sponges, Endemoceras, Cylindroteuthis, jasper, ice-scratched Carboniferous Limestone, green micaceous sandstone, Kosmoceras, Productus in Carboniferous Limestone, Polyptychites, Mammoth tooth, Mammoth tusk.

Hornsea (south) on beach - Jurassic oyster beds, Lithostrotion, Gryphaea arcuata , Dactylioceras commune. Arnioceras semicostatum, Asteroceras, Aegocrioceras, ?Polypychites, Crinoid fragments, Pentacrinus, Acroteuthis, Hibolites jaculoides, Neohibolites, carnelian, Lithostrotian in red Carboniferous Limestone, Magnesian Limestone, green conglomerate, Cardinia, Larvikite, Scandinavian porphyry, belemnite from the Chalk, jet, coal, Exogyra. very large ammonite (ca 70cm dia) in a cement stone. .

Keyingham (new pit) - garnet mica schist, Corbicula fluminaris (common), chalk bored by piddocks, muscovite schist (common) chalk, Cardinia edule, dogger (common), grey flint, New Red Sandstone, jasper, basalt, Kimmeridge Clay, brown sandstone, B. mucronata, red flint, D. commune, Pentacrinus. modern oyster (big, round, flat; some bored), gneiss, pink granite, Larvikite, Macoma baltica, rhomb porphyry, Jurassic shelly limestone, Old Red Sandstone, black flint, pink chalk, Dentalium in limestone, calcrete, Oysters, B. mucronata, Gryphaea, Corbicula .

Kilnsea - black flint, rhomb porphyry, jasper, Gryphaea, small Echinocorys in black flint, coal, Mammoth tusk.

Mappleton (north) - Larvikite, Jurassic plant bed, jasper, Jurassic shelly limestone, dogger, red flint, Rhomb Porphyry, carnelian, Brockram, Frosterly Marble, Lithostotian, belemnite in limestone, green conglomerate.

Mappleton (south) in situ in cliff - Chalk (very common), Gryphaea, Jurassic belemnite, jasper, B. mucronata, red chalk, Kimmeridge Clay, grey flint, New Red Sandstone, turreted gastropod, Magnesian Limestone, sponge-bored chalk, yellow quartz, brown sandstone, green sandstone, coal, pyrite, ice-scratched Carboniferous Limestone, gneiss, gabbro, Hibolites, Jurassic plant bed, Pentacrinus, black flint, Dactylioceras tennuicostatum, Pleuromya, Lithostrotian, D. commune, Old Red Sandstone, pink chalk, Exogyra, black shale, grey flint, septarian nodule, Magnesian Limestone, pink granite, Whin Sill, streak of soft chalk, raft of soft dark grey clay, coarse brown sandstone, jasper, quartzite, rippled brown sandstone, greensand, Arnioceras, dogger, chert, grey sandstone, coal, Aegocrioceras, Cardinia, Cheviot black porphyry, biotite gneiss, Old Red Sandstone, coal.

Mappleton (south) on beach - gneiss, Pleuyromya, Acroteuthis, Hibolites, Neohibolites, Oxyteuthis, Pentacrinus, D. commune, Frosterly Marble, Jurassic Oolite, Asteroceras, jasper, Lithostrotian, Magnesian Limestone, New Red Sandstone, Old Red Sandstone, red flint, ?Galerites in black flint, Brockram, Larvikite, Cheviot porphyry, Scandinavian porphyry, Tilberthwaite Tuff, Dacromya ovum.

Marske beach (going south) - grey Jurassic limestone (common), red Cheviot porphyry, black Cheviot porphyry, yellow quartz, white quartz, Old Red Sandstone, jasper, brown sandstone, Whin stone, Lithostostrotian, greensand, New Red Sandstone, pink granite, Lithostrotian in red limestone, basalt, rippled brown sandstone, coarse brown sandstone, Jurassic rootlet bed, Cannon Ball Limestone.

Marske - The Stray - Gryphaea (common), ammonites, Jurassic shelly limestone, Lithostrotian, Old Red Sandstone, jasper, greensand, brown sandstone, pink granite, white quartz, yellow quartz, gneiss, New Red Sandstone, coarse brown sandstone, Middle Jurassic rootlet bed, black Cheviot porphyry, brown flint, black flint, quartzite, carnelian.

May Beck (North Yorkshire) - Shap Granite.

Ravenscar - Shap Granite, basalt.

Ringborough - chalk, black flint, grey flint, Lithostrotian, yellow quartz, red flint, black shelly Carboniferous Limestone, jasper, Gryphaea (rare) , gneiss, septarian nodule, large phragmacone, Nautilus in Jurassic nodule, B. mucronata, white quartz, brown quartz, Jurassic rootlet bed, red chalk, New Red Sandstone, brown sandstone, Kimmeridge cementstone, Gryphaea in limestone, rhomb porphyry (rare), Kimmeridge Clay, pyrites, dogger, green conglomerate, coal, large fossil plant.

Ringborough in situ beach exposure ( 270378 to 274372) - Oxyteuthis, pyrite, Jurassic belemnite, spetarian nodule, chalk, black flint, Gryphaea in limestone, New Red Sandstone, jasper, Asteroceras, Hibolites, dogger, Cardinia, Cheviot Porphyry, Lithostrotian, pink chalk, Gryphaea gigantea, Upper Jurassic belemnites, Pleuroceras, pyritised wood, dolerite, grey flint, Kimmeridge Clay, yellow quartz, Pentacrinus, pink quartz, D. commune, Speeton Clay phosphate nodule.

Ringborough (south from new way down to wartime defenses) in dark red-brown boulder clay cliff - New Red Sandstone (common), black shale (common), grey Middle Jurassic sandstone, septarian nodule, Lias nodules, grey flint, chalk (not too common), dogger, basalt, Gryphaea, dark grey sandstone, Jurassic belemnites, grey mudstone, red granite, Gryphaea gigantea, red streaks of clay, grey streaks of clay, Jurassic shelly limestone, Old Red Sandstone, jasper, pink chalk, gneiss, quartzite, B. mucronata, phosphate nodule (? from Speeton Clay), pyrite, ice scratched Carboniferous Limestone, coarse brown sandstone, grey granite.

Runswick Bay in situ in cliff - dark grey shale, brown sandstone, pale brown sandstone, buff oolitic limestone, New Red Sandstone, yellow quartz, Cheviot Porphyry, basalt, grey micaceous sandstone, green conglomerate, orange-brown micaceous sandstone, white quartz, dogger.

Runswick Bay loose on beach - Shap Granite, Carboniferous Limestone with brachiopods, Jurassic shelly limestone, Jurassic rootlet bed, red granite, red conglomerate.

Saltburn (north of the pier) - Brockram, Cannon Ball Limestone, yellow quartz, brown sandstone, Cheviot porphyry, Old Red Sandstone, rippled brown sandstone, coarse brown sandstone, basalt, pink granite, quartzite, gneiss, black flint, Lithostrotian, grey Jurassic limestone (common) , ironstone (common).

Saltburn (south of the pier) - Brockram, Jurassic shelly limestone, brown sandstone, Norwegian rhomb porphyry, Gryphaea, gneiss, basalt, yellow quartz, amygdaloidal lava, Lithostrotian, grey Cheviot porphyry.

Scalby - white quartz, Carboniferous Limestone, Scandinavian porphyry, basalt, shelly Jurassic Limestone, carnelian, Lithostrotian, Cheviot porphyry, granite, jasper, Shap Granite, yellow quartz, black flint, Gryphaea, Brockram, Lopha, red flint.

Sewerby - Shap Granite, Magnesian Limestone, Old Red Sandstone, New Red Sandstone, Cheviot Porphyry, Jurassic shelly limestone, Middle Jurassic Rootlet Bed, Norwegian Porphyry, Brockram, augen gneiss, crinoidal Carboniferous Limestone, basalt, Productids in red Carboniferous Limestone, Cannon Ball Limestone.

Skipsea - Dactylioceras commune, oysters in limestone, orthoclase [pink feldspar], Gryphaea, Gryphaea gigantia, large phragmacone of belemnite in grey nodule.

Skipsea (in cliff) - Chalk (rounded and not common), greensand, sandstones, yellow quartz, Middle Jurassic plant bed, granites, black shale (white common) basalt, quartzite, coarse brown sandstone, amygdaloidal lavas, gneiss, Whin Sill, Jurassic belemnites, Old Red Sandstone, coal, 'Cheviot' porphyry, jasper, black flint (not common), dark red microgranite, small modern shells, Brockram, carnelian.

Snettisham Scalp (North Norfolk; TF648336) - black flint, brown flint, chalk, red chalk, Old Red Sandstone, brown rippled sandstone, basalt, white quartz, black Cheviot Porphyry, jasper veined red sandstone, coarse brown sandstone (?Carstone), grey flint, brown gritstone, grey sandstone, Jurassic rootlet bed, greensand, yellow quartz, gneiss, New Red Sandstone, Jurassic shelly limestone, carnelian, red granite, Gryphaea.

South Landing - Brockram; Jurassic rootlet bed

South Landing erratics in the chalk gravels below the tills in the cliff - white quartz, brown sandstone, Carboniferous Limestone, grey flint, yellow quartz, coal, limonite.

Speeton - Pleuroceras, Cheviot porphyry, Lithostrotian, Jurassic rootlet bed, Jurassic shelly limestone, .Larvikite, Norwegian porphyry, Hildoceras, Brockram,

Stillingfleet (Vale of York, SE592409) - sandstone (common), Carboniferous Limestone, chert, Whin Sill.

Spurn - Mammoth tusk.

Spurn Point - crinoid in Carboniferous Limestone, rhomb porphyry, carnelian.

Ulrome (TA 1751 5715) in situ in cliff - Chalk, black flint, soft Chalk stringers, smoky quartz, limonitic sandstone, brown sandstone, Whin Sill, Middle Jurassic rootlet bed, grey flint, jasper, coal, New Red Sandstone, Old Red Sandstone, green sandstone, orange sandstone, pink chalk, green jasper, Gryphaea, white quartz, Cardinia, haemetite, Lower Jurassic shelly limestone, black porphyry, gneiss.

Walsingham, Norfolk ( 927 378) - yellow quartz, white quartz, brown sandstone, quartzite.

Welton-le-Wold, Lincolnshire, eastern site - quartzite, shelly Jurassic oolite, Whin Sill, Neohibolites, Cheviot porphyry, Chalk, grey flint, black flint, coal, brown sandstone, yellow quartz, white quartz.

Welton-le-Wold, Lincolnshire, western site - large erratics - gneiss, grey granite, basalt, sandstone with ?Camptonectes, Deltaic Sandstone.

York - in the grounds of Yorkshire Museum - Shap Granite (Tom Sheppard 1903 records that this was collected from Filey).

References/further reading :

Harrison R & Horne M 1992. The East Yorkshire Boulder Committee, report for the years 1987 to 1991. Humberside Geologist 10, 18-22.

Horne M 1992. Starting Geology in East Yorkshire. Humberside Geologist 10, 13.

Horne M 2000. Report of the East Riding Boulder Committee 1992 to 2000. Humberside Geologist 13, 42-45

Rockett T 1992. Glaciation and the Yorkshire Coast. Humberside Geologist 10, 14.

Sheppard T 1903. Geological Rambles in East Yorkshire. 235pp Browns, Hull.

To be published in Humberside Geologist

Report for 2001-4

Some Definitions

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