﻿Yol. 6 1.] IN THE NORTH- STAFFORDSHIRE COAL-MEASURES. 



499 



Fig. 1. — Vertical section illustrating 

 the succession of the marine horizons 

 in the Coal- Measures of North 

 Staffordshire. 



[Scale : 1 inch = 600 feet.] 



i^vJ 



Limestone aboveJBassey Mine 



Limestone below Great-Row Coal 



Bay-Coal Marine Bed 

 Priorsfield Marine Bed 



Nettlebank & Speedwell Marine Bed 

 Florence-Colliery Marine Bed 



Marine Bed above Moss Coal 

 Moss-Cannel Marine Bed 



Limestones over Bowling-Alley Coal 



7-feet Banbury Marine Bed 



Knypersley Mauine Band 



Crabfcree Coal Marine Bed 



Their relative positions are 

 illustrated in fig. 1, a glance 

 at which will show that they 

 occur at intervals remarkably 

 convenient for the purpose of 

 subdivision of the measures ; 

 and, when supplemented by 

 the existence of entomostracan 

 limestones, they ensure com- 

 plete correlation of the Coal- 

 Measures, with a precision such 

 as to satisfy the needs of com- 

 mercial men. 



The places where these hori- 

 zons have been traced are 

 shown in PI. XXXIV (facing 

 p. 514), which is an outline- 

 map whereon the following 

 localities are represented by 

 the numerals given in the 

 list :— 



1. Silverdale, No. 16 Pit. 



2. Leycett Colliery. 



3. Hayeswood Colliery. 



4. Minnie Pit, Halmerend. 



5. Talk-o'-th'-Hill Colliery. 



6. Birchenwood, No. 18 Pit. 



7. Chell Colliery. 



8. Norton Colliery. 



9. Nettlebank Sinking. 



10. Sneyd Colliery. 



11. Slippery-Lane Pit, Hanley. 



12. Berry Hill, Deep Pit. 



13. Weston Sprink. 



14. Meir-Hay Colliery. 



15. Speedwell Colliery. 



16. Priorsfield. 



17. Foley Colliery. 



18. Longton-Hall Colliery. 



19. Florence Colliery. 



The thicknesses of the beds 

 in all sections are measured 

 perpendicularly to their bed- 

 ding-planes, unless the contrary 

 is stated. 



(1) Roof of the Bay or 

 Lady Coal. 



This bed was discovered by 

 Mr. John Ward, in 1863, at 

 the Foley Colliery, near Long- 

 ton (17 in PI. XXXIV), over- 

 lying the Bay Coal at that 

 place ; and, although it had 

 been passed through many 

 2n2 



