ON PHOTOGRAPHS OF GEOLOGICAL INTEREST. 



261 



7196 (7) Cowcroft, near Chesham 



7197 (8) Cowcroft, near Chesham 



7198 (9) Cowcroft, near Chesham 



7199 Walter's Ash .... 



7200 Walter's Ash .... 



7201 Walter's Ash . . . . 



7202 Walter's Ash . 



7203 Hartwell, 2 m. S.W. of Aylesbury 



Erosion hollows in Reading beds filled 



with pebble drift. 1915. 

 Erosion effect on Reading Sands of a 



storm. 1915. 

 Erosion effects on Reading Sands of a 



storm. 1915. 

 Blocks of Sarsen for repair of Windsor 



Castle. 1919. 

 Sarsen workings. 1919. 

 Sarsens in situ. 1919. 

 Sarsens in situ. 1919. 

 Large ammonites and concretions from 



Portlands built into wall. 



Photographed by H. W. Turner, M.A., The University, Bristol. P.C. 



7204 (1-24-3) Calvert Brick Works, Method of working Oxford Clay pit. 



Charndon 1926. 



Cornwall. — Photographed by G. M. Davies, M.Sc, 104 Avondale Road, 



South Croydon. 1/1. 



7205 (8-8) W. of St. Ives . . . ' Greenstone ' resisting wave action. 



7206 (8-11) Land's End 



1908. 



' Castellated ' weathering of granite due 

 to vertical jointing. 1908. 



7207 (12-25) Marble Cliff, Porthmissen, Alternating limestone and slate (Up. 



2 m. W. of Padstow Devonian). 1912. 



Photographed by E. H. Davison, B.Sc, School of Mines, Camborne. 3x2. 



7208 Pendour Cove, Gurnard's Head, Granite veins cutting greenstone boulder. 



Penzance 1926. 



7209 Cullis' Qu., Ponsanooth . . Vein of pegmatite in granite with selvage 



of aplite. 1926. 



7210 Fistral Bay, Newquay . . Raised Beach with vertical cylindrical 



pipes. 



Photographed by F. Engleheart and presented by E. H. Davison, B.Sc, 

 School of Mines, Camborne. P.C. 



7211 Cullis' Qu., Ponsanooth . . Pegmatite vein with aplite margin. 

 Photographed by G. G. Lewis, Ellerslie Road School, London, 



w. 12. iyi. 



7212 (17) Fistral Bay, near Newquay . 



7213 (20) Pentire Head . . ' . 



7214 (21) Perranporth 



7215 (22) Bedruthan Steps, N. of New- 



quay 



7216 (23) Holywell . . . . 



Raised beach. 



Differential erosion of vertical Devonians. 



Stages in the production of stacks and 



inlets. 

 Dependence of form of sea stacks on dip. 



Sand dunes with marram grass. 



Photographed by the late T. W. Reader and presented by F. \Y. Reader. 1/1. 



7217 (90) Baulk Head, Lizard . 



7218 (91, A) Baulk Head, Lizard 



7219 (87) Gunwalloe, Lizard 



7220 (98) Gunwalloe . 



7221 Mullion . 



7222 Kynance . 



7223 Kynance . 



Manaccan Series (L. Devonian). 1913. 

 Manaccan Series (L. Devonian). 1913. 

 Folded Manaccan beds. 1913. 

 Contorted Veryan sandstone. 1913. 

 Cliffs of hornblende schist. 1913. 

 Formation of arches by marine erosion 



along joints in serpentine. 1913. 

 Serpentine coast. 1913. 



