HOWARTH : NOTES ON BOULDER MARKINGS. 
51 
In the area comprised in this map (Plate XIV.) they are 
recorded on the beach at Saltburn, Whitby, Kettleness, Robin 
Hood's Bay, Gristhorpe, and Filey : at Ayton, Seamer. Hutton 
Bushell in the Vale of Pickering, and Yedmandale. 
They are also found at Kirk Moorgate, near Whitby, at 
550 feet O.D. At the Peak at 600. at Danby at 625, at Stump 
Howe at 650, on Eastington High Moor at 700, and at West 
Rigg at 810. 
The following rocks have been definitely identified and from 
their distinctive characters continue to throw much light upon 
the distribution of non- British erratics in Yorkshire : — 
Rhomb Porphyry \ 
Augite Syenite (Laurvikite) I ^ , 
^. ^ . from Southern Norway. 
Zircon-Syenite I 
Elaeolite-Syenite I 
Sandstone or Grit (Sparagmit-Conglomerat) from north 
of Christiania. 
Post Archaean Granite from Angermanland in Sweden 
or Aland on the Gulf of Bothnia. 
Halleflinta from Sweden. 
Syenitic-dyke-rock from Longen Valley or north of 
Christiania. 
All the above, with the exception of the Archaean Granite 
and Halleflinta, are recorded within the area covered by the 
map. 
