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Session 1928–1929
No. 313.
SESSION
1928 - 29.
lJr£sibtttt: Prof. A.
l\JORLEY DAVIES,
D.Se., A R.C.S.,
F.G.S. THE NEXT MEETING oj the Association will be held in the
Architectural Theatre, University College, Gower Street, W.C.1, at 7.30 p.m., on Friday, December 7th, 1928. The following Papers will be read:-
St. Austell Detritals. By
J. G. C.
LEECH,
A.R.S.M.
"Some Features of Cornish Lamprophyres." By H. G. SMITH, B.Sc., A.R.C.S., F.G.S. Most of the lamprophyres examined lie along a curved strip of country extending from Falmouth, via Newquay, to Wadcbridge and Padstow. The rocks contain biotite as the dominant ferro-magnesian constituent and are, on the whole, too fine-grained for any other mineral to be recognisable in the field. Almost invariably, however, occasional inclusions coarser in texture can be found, and the paper is concerned with a detailed examination of these. Corundum, sillimanite, and green spinel are recorded, together with quartz and felspar associated in a manner closely resembling graphic structure. Some of these patches appear to be fragments of sediments or metamorphic rock in their original condition; others seem to be merely vesicles filled in with low-temperature minerals, If some of the" xenoliths" should prove to be more or less metamorphosed contents of vesicles, it suggests the possibility that the lamprophyres are older than the granites and that the metamorphic aureoles of the latter are more extensive than has been considered.
The Papers will be illustrated by lantern-slides. Two visitors may be introduced by each member. K.H.-The Theatre will be open at 7 p.m. for t hr- convr-nir-nco of t hosc membe-rs who wish to arri ve early,
The Council will meet at 6.30 p.m. The Library is open on Ordinary Meeting nights until 7.30 p.rn. for the convenience of Members who wish to read or borrow books.
P.T.D.
" Proceedings." With this Circular Part III of the Proceedings, Vol. XXXIX, will be issued to members whose subscriptions are not in arrear.
Subscriptions for 1928. Subscriptions for 1928, now overdue, should be forwarded to the Treasurer, A. E. Greene, M.A., B.Se., ] lla, Shooter's Hill Road, Blackheath, S.E.3.
Members. Elected on znd November, 1928 :-Frank Higham, B.Sc., A.R.S.M., F.G.S., II, Bridgwater Road, Alperton, Middlesex; Malcolm MacGregor, B.Com., I, Kidderpore Avenue, N.\V".3; and Major Sir Francis Davidson Outram, Bart., O.B.E., Alfreton, Sevenoaks, Kent. Proposed for election on 7th December, 1928 :-Rev. Brade-Birks, GEOlogical Dept., Agricultural College, Wye, Kent; Arthur Lawrence De Almeida, 28, Hazlitt Road, West Kensington, W.I4; Aidan Craven, Sidney Sussex College, Cambridge; Harold Frank Escott, 46, Gleneagle Road, Streatharn, S.W.I6; Miss Dorothy Leslie Hayes, 37, Dunbar Road, N.22; Miss Fredericka H. Holt, B.Sc., 10, Merton Road, Hampstead, N.W.3 ; Miss Isabella Mortimer King, B.Sc., 4, Cambridge Gardens, Pilrig, Edinburgh; George Mitchell, 26, Cranleigh Road, Tottenham, N.I5; Miss Dinah Q. R. Symonds, B.Sc., I, Cutcliffe Place, Bedford; Michael John Thompson Pickles, Downing College, Cambridge and 2, Sunny Brow, Kendal; Edward Talfourd Salter, Karrakatta, Crofton, Marlborough, Wilts.; Estcourt Gooddine Potter Timmins, Argyll Lodge, Runcorn; Cheshire; and Walter Henry Young, M.A., Haye Leigh, Duffield Road, Derby.
Preliminary Announcement. At the meeting on 4th January a lecture will be delivered on the" Ccology of the West Indies," by K. W. Earle, D.Sc., F.G.S.
22,
E. ERNEST S. Wisteria Road, Lewisham, S.E.I3. 27th November, 1928.
BROWN, F.G.S., Secretary.
SESSION
1928 - 29.
lJr£sibtttt: Prof. A.
l\JORLEY DAVIES,
D.Se., A R.C.S.,
F.G.S. THE NEXT MEETING oj the Association will be held in the
Architectural Theatre, University College, Gower Street, W.C.1, at 7.30 p.m., on Friday, December 7th, 1928. The following Papers will be read:-
St. Austell Detritals. By
J. G. C.
LEECH,
A.R.S.M.
"Some Features of Cornish Lamprophyres." By H. G. SMITH, B.Sc., A.R.C.S., F.G.S. Most of the lamprophyres examined lie along a curved strip of country extending from Falmouth, via Newquay, to Wadcbridge and Padstow. The rocks contain biotite as the dominant ferro-magnesian constituent and are, on the whole, too fine-grained for any other mineral to be recognisable in the field. Almost invariably, however, occasional inclusions coarser in texture can be found, and the paper is concerned with a detailed examination of these. Corundum, sillimanite, and green spinel are recorded, together with quartz and felspar associated in a manner closely resembling graphic structure. Some of these patches appear to be fragments of sediments or metamorphic rock in their original condition; others seem to be merely vesicles filled in with low-temperature minerals, If some of the" xenoliths" should prove to be more or less metamorphosed contents of vesicles, it suggests the possibility that the lamprophyres are older than the granites and that the metamorphic aureoles of the latter are more extensive than has been considered.
The Papers will be illustrated by lantern-slides. Two visitors may be introduced by each member. K.H.-The Theatre will be open at 7 p.m. for t hr- convr-nir-nco of t hosc membe-rs who wish to arri ve early,
The Council will meet at 6.30 p.m. The Library is open on Ordinary Meeting nights until 7.30 p.rn. for the convenience of Members who wish to read or borrow books.
P.T.D.
" Proceedings." With this Circular Part III of the Proceedings, Vol. XXXIX, will be issued to members whose subscriptions are not in arrear.
Subscriptions for 1928. Subscriptions for 1928, now overdue, should be forwarded to the Treasurer, A. E. Greene, M.A., B.Se., ] lla, Shooter's Hill Road, Blackheath, S.E.3.
Members. Elected on znd November, 1928 :-Frank Higham, B.Sc., A.R.S.M., F.G.S., II, Bridgwater Road, Alperton, Middlesex; Malcolm MacGregor, B.Com., I, Kidderpore Avenue, N.\V".3; and Major Sir Francis Davidson Outram, Bart., O.B.E., Alfreton, Sevenoaks, Kent. Proposed for election on 7th December, 1928 :-Rev. Brade-Birks, GEOlogical Dept., Agricultural College, Wye, Kent; Arthur Lawrence De Almeida, 28, Hazlitt Road, West Kensington, W.I4; Aidan Craven, Sidney Sussex College, Cambridge; Harold Frank Escott, 46, Gleneagle Road, Streatharn, S.W.I6; Miss Dorothy Leslie Hayes, 37, Dunbar Road, N.22; Miss Fredericka H. Holt, B.Sc., 10, Merton Road, Hampstead, N.W.3 ; Miss Isabella Mortimer King, B.Sc., 4, Cambridge Gardens, Pilrig, Edinburgh; George Mitchell, 26, Cranleigh Road, Tottenham, N.I5; Miss Dinah Q. R. Symonds, B.Sc., I, Cutcliffe Place, Bedford; Michael John Thompson Pickles, Downing College, Cambridge and 2, Sunny Brow, Kendal; Edward Talfourd Salter, Karrakatta, Crofton, Marlborough, Wilts.; Estcourt Gooddine Potter Timmins, Argyll Lodge, Runcorn; Cheshire; and Walter Henry Young, M.A., Haye Leigh, Duffield Road, Derby.
Preliminary Announcement. At the meeting on 4th January a lecture will be delivered on the" Ccology of the West Indies," by K. W. Earle, D.Sc., F.G.S.
22,
E. ERNEST S. Wisteria Road, Lewisham, S.E.I3. 27th November, 1928.
BROWN, F.G.S., Secretary.