48 KEPORT — 1875. 



Table I. — Geological Formations in the Bristol Districts. 



Periods. 



Post Tertiary . 



TERTiAny ■ 



Cretaceous . , 



Jurassic 



Lias SIC. 



Thiassic 

 Permian 



Carboniferous < 



Devonian .... 



Upper Silurian 

 Igneous Rocks. -I 



Divisions. 



Recent ....-< 

 Post Pliocene . 



Upper Oolite . . 

 Middle OoUte , 



Lower Oolite 



Upper 



Lower .... 



Old Red. . . . 



Formations. 



Alluviuni 



Peat 



Gravel 



Greensand 



Coral Rag 



Oxford Clay .... 



Cornbrash 



Forest Marble . . 

 Bradford Clay . . 



Bath Oolite 



Fuller's Earth . . 

 Inferior Oolite . . 

 Liassic Sands .... 

 Upper Lias Clay. . 

 Marlstone 



Clays 



Clays 



Limestones .... 

 Avicula cuntorta . 



Keuper 



DolomiticConglo- 

 nierate 



Coal Measures . . 



Millstone Grit . . 



Upper Shales . . 

 Carboniferous 



Limestone . . 



Lower Shales . . 

 Sandstones .... 



Conglomerates . . 



Ludlow 



Wenlock 



Upper Llandovery 

 Greenstone . . 

 Basalt 



Typical Localities. 



Bristol, Shirehampton. 

 Cheddar, Glastonbury. 

 Cheddar railway, Keynsham, 



Saltford. 

 Absent. 

 Postlebury. 

 Absent. 

 Cloford. 



Cloford, Marston Bigot. 

 Chickwell, Faulldand. 

 Bradford. 



Coorabedown Lausdown P. 

 North Stoke, Lausdown, Box. 

 Dundry, Cotteswold HiUs. 

 Dundry, Midford, Frocester. 

 Dundry, Midford, Frocester. 

 Dundry, Sodbury, Stinch- 



combe. 

 Dundry, Sodbury, Stinch- 



combe. 

 Hoi-field, Pell. 

 Keynsham, Saltford. 

 Aust, Beechum, Garden Cliff. 

 New River, Cothara. 



Bristol, Portishead, Clevedon. 



Absent. 



Mangotsfield, Radstock, &c. 



Brandon Hill, Fish-ponds, &c. 



Clifton, Ashton, Fish-ponds. 



Clifton, Mendips, Tortworth. 

 Clifton, Clevedon, Tortworth. 

 Clifton, Portishead, Mendips, 



&c. 

 Clifton, Portishead, Mendips, 



&c. 

 Berkeley, Purton Passage. 

 Tortworth, Falfield. 

 Tortworth, Damory. 

 Damory, Chariield, "Woodford, 

 Uphill, Mendips, Weston. 



The localities in this Table may be grouped into six districts : — 



1. Tortworth district. 4. Bristol district. 



2. Mendip Hills. 5. Dundry district. 



3. Radstock district. 6. Bridgewater district. 



1. Tortworth District. 



Silurian. — Tortworth has long been classical groimd to the geologist, and was 

 first brought into notice by Dr. Cooke, formerly (1799-1836) rector of the parish. 

 This gentleman made an extensive collection of fossils from all the rocks in the 

 district, which after his death passed through my hands ; and I can therefore speak 



