Welcome to the Ice Age Coast
Glacial Erratic Pebbles
(mostly from the Holderness Coast)
Click on the thumbnail image to view larger picture
Quartz found at
Speeton
Pyrite
Agates
granite found at
Hornsea
plutonic igneous rock, type and
origin uncertain
Rapakivi Granite derived from
Aaland, found in Norfolk, donated by John Barrie
Rhomb Porphyry, probably from
Norway
Basalt Porphyry from Oslo Fjord, Norway (identified by Tom)
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 rock
unidentified
igneous rock
? Tuff found at Hornsea and
Barmston
? Quartzite
? 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, perhaps from Scotland
Brockram found at Cayton Bay
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 flint
found at Barmston and Hornsea, possibly originally from Heligoland.
Lower Jurassic ammonite found at
Barmston
Arnioceras
erratics from the Holderness coast, photos by "Stone Treasures"
Oxyteuthis
found as an erratic at Welton Le
Wold, Lincolnshire
Trace fossils from Mappleton
Pentacrinus
? Pseudomytilloides
found at Aldborough
Plesiosaur vertebra found at
Hornsea
Micraster
in
black flint, found as an erratic at Mappleton by A Frostick
Most of these images were made using a flatbed scanner and moistened specimens
(c) Mike Horne & Hull Geological Society 1999 + 2021