J POST-GLACIAL DEPOSITS, CHIEFLY BRITISH. 



LAND AND FRESHWATER TYPES. 



0 j c. Peat, marl, and other deposits, now forming in lakes, rivers, etc. 

 b. 



a. ? Irish round towers.— Egyptian pyramids. 



? Stonehenge. 



Carnon and Pentuan (Cornwall) silt, containing human remains (Colenso). 

 Cardigan Scotch fir submarine forest (Yates). 



Irish submarine peat bogs. (? Dogger-bank and much of the German Ocean above the sea. Ire- 

 land and Spain united: present Asturian flora of S. and W. of Ireland, the remnants of thatunion.) 

 ? In Denmark, "Borreby people" living. 



b. Kiltiernan (Co. Dublin) Reindeer deposit (Oldham). 

 Irish upland forests. 



Irish and Isle of Man Megaceros Hihernicus marls (Forbes). 



j £ S (c. Menchecourt (Valley of the Somme) low-level flint-implement gravel (Estuarine). — Mun- 

 | ^ J desly (Norfolk) Hydrohia marginataheds (Lyell) .—Brentford (Thames) mammaliferous 

 lp§ |S gravel (Morris). — River Air (Yorkshire) Hippopotamus alluvium (Denny). 

 I Jj ^ i b. Last glaciation of British Isles, during which Caernarvonshire " marine drift " was scoured 

 |3 * out — Cwm-llafar, Nant Francon, etc. (Darwin, Ramsay) ; old unstratified till swept off 



land surfaces and rearranged (Escars) ; Brixham (Pengelly), Gower (Falconer), and 

 Wookey-hole (Dawkins) rocks, with ossiferous fissures, eroded; also high-level flint- 

 implement gravels of Biddeuham, Amiens, and St. Acheul, in part washed off. — Copford 

 (Essex) " brown clay with boulders " (Brown). 



z. Copford (Essex) Helix incarnata marl (Brown). — Infilling of Brixham (Devonshire), Gower 

 (Glamorganshire), Wookey-hole (Somersetshire), and other ossiferous fissures. — St. Acheul and 

 Amiens high-level flint-implement gravels. — Cropthorn (on the Avon) Cyrena consobrina allu- 

 vium (Strickland).— Hoxne (Suffolk) and Biddenham (Bedfordshire) flint-implement gravels. 

 — Grays (Essex) Unio littoralis bed. 



c. Cromer contorted drift (Lyell). 



b. (No subaerial surfaces within the area of British Isles, except highest mountains, (Lvell, fig. 39, 

 p. 276.) 



(Subaerial surfaces much decreased ; as represented by Lyell, 1 Antiquity of Man,' fig. 40, p. 287.) 

 a. ? Muswell Hill (near London) drift. 



c. Much uustratified till, formed in preceding stages, eroded and rearranged.— Copford (Essex) 

 " grey gravel with boulders " (Brown). 



b. Highest and lowest regions enormously glaciated, the resulting debris (unstratified till) often 

 becoming mixed with the Scandinavian iceberg-transported blocks of the Pliocene period, es- 

 peciallv in the area of the Gentian Ocean (not in existence at this time).— Much of the surface- 

 features of the British Jsles formed. Antrim basaltic plateau iu many districts deeply eroded ; 

 formation of valleys of the Thames, Severn, Tyne, Tees, etc. 



or. 



Highest mountain-regions of British Isles under glaciation. 

 Cromer (Norfolk) Norway spruce-forest bed. 



