Glacial Erratics
(mostly from the Holderness Coast)
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Quartz found at Speeton
Pyrite
Agates
Large Shap Granite boulder at Sewerby Steps
granite found at Hornsea
plutonic igneous rock, type and origin uncertain
Rapakivi Granite derived from Aaland, donated by John Barrie
Rhomb Porphyry, probably from Norway
porphyry (perhaps from the Cheviots) found at Hornsea, Speeton and Barmston
porphyry found at Barmston
amydaloidal lavas
another ? lava
Mica schist found at Hornsea
Garnet mica schist found at Barmston
unidentified ? metamorphic rocks
? Tuff found at Hornsea and Barmston
?
Ingletonian conglomerate from Lake District found at Barmston and Speeton
Ice
scratched boulders of Carboniferous Limestone
corals in Carboniferous Limestone found at Hornsea and Speeton and in Holderness
Black Carboniferous shelly limestone found at Barmston ( a specimen of similar
rock on diaplay at the National Museum of Scotland is described as Mussel
Band from Ratho Quarry in Lothian)
Brockram found at Cayton Bay
cementstone nodule, probably from Lower Jurassic
Septarian nodule
Middle Jurassic sandstones found at Hornsea and Barmston
Oyster bed/shelly Limestone Lower Jurassic, found at Barmston
grey flint found at Hornsea
Black flint nodule, probably from bed of the North Sea
Red flints found at Barmston and Hornsea, possibly from Heligoland.
large Nautilus from the Jurassic, found at Hornsea (photo by
Gordon Binns)
Lower Jurassic ammonite found at Barmston
Arnioceras erratics from the Holderness
coast, photos by Stone
Oxyteuthis found
as an erratic at Welton Le Wold, Lincolnshire
Trace fossils from Mappleton
Pentacrinus
? Pseudomytilloides found at Aldborough
Plesiosaur vertebra found at Hornsea
Echinocorys
in Chalk found at Cowden
Micraster
in black flint, found as an erratic at Mappleton
by A Frostick
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