96 



M.K. HOWARTH 



STAGE 



ZONE 



SUBZONE 



m 



BED NO 





U. Pliensbachian 



Margaritatus 



Stokesi (part) 



600.6-601.2 



STAITHES 

 SANDSTONE 

 FORMATION 



Lower 

 Pliensbachian 



Davoei 



32.63 m 



Figulinum 



9.70 



596.2-600.5 



Capricornus 



3.04 



591-596.1 



Maculatum 



19.89 



581-590.7 



Ironstone 



Shale 

 Member 

 62.73 m 



a 



z 

 o 



H 

 < 



O 



W 



z 

 o 



E-i 



Q 



D 



§ 



< 

 U 



1 



Ibex 

 20.39 m 



Luridum 



7.24 



578.1-580 



Valdani 



7.66 



571-577 



Masseanum 



5.49 



560.3-570 



Jamesoni 

 44.46 m 



Jamesoni 



5.66 



550-560.3 



Brevispina 



3.72 



544.6-549 



Polymorphus 



7.05 



538-544.5 



Taylori 



28.03 



527-537 



501.1-526.7 



Pyritous Shale 

 Member, 26.18 m 



Upper 

 Sinemurian 



Raricostatum 

 17.26 m 



Aplanatum 



5.57 



497-500 



496 



Siliceous 



Shale 

 Member 

 38.74 m 



Macdonnelli 



4.48 



494-495.7 



Raricostatoides 



6.21 



488-493.5 



Densinodulum 



1.00 



486.3-487 



Oxynotum 

 14.91 m 



Oxynotum 



9.19 



472.1-486.2 



Simpsoni 



5.72 



463-471 



Obtusum 

 12.45 m 



Denotatus 



3.37 



455.2-462 



Stellare 



7.37 



447-455.1 



Obtusum 



1.71 



446.31-446.5 



Calcareous 



Shale 



Member 



23.35 m exposed 



Lower 

 Sinemurian 



(part) 



Turneri 



7.75 m 



Birchi 



5.89 



433.3-446.2 



Brooki 



1.86 



429.7-433.2 



Semicostatum 

 13.89 m 



Sauzeanum 



13.89 



418-429.64 



Scipionianum 



Not exposed 



Reynesi 



Table 1 Summary of the bed numbers used in Robin Hood's Bay, and their grouping into zones and subzones (including thicknesses), and members and 

 formations, showing the detailed correlation between biostratigraphical and lithostratigraphical divisions. 



however, he used three places of decimals (eg. bed 590.433) and in 

 bed 598 he used four places of decimals (eg. bed 598.4322). Three 

 and four places of decimals are considered here to be too cumber- 

 some to be acceptable, so they have all been replaced in this 

 description with the minimum amount of renumbering necessary to 

 achieve single and double decimal numbering in beds 590 and 598. 

 Unfortunately, it was not possible to replace all the double decimal 

 numbering in the succession, because there are more than 9 divisions 

 in beds 429, 495, 544 and 590, and to replace them would have 

 involved renumbering the whole succession. This was not practica- 

 ble in view of the large number of entries of the original bed numbers 

 on specimen labels, index cards and original manuscripts and maps. 

 It should be noted, however, that the subdivisions that Bairstow used 

 for bed 600 are not in a decimal system like those in all the lower beds 

 - subdivisions of bed 600 use the 13 suffix numbers 1-13 after the 

 decimal point; as these are at the top of the succession extending out 

 of Robin Hood's Bay to the north, they are retained here without 

 alteration. 



DETAILED SUCCESSION IN ROBIN HOOD'S 

 BAY 



In the following detailed succession records of all the ammonites and 

 nautiloids in Bairstow's collection are included for each bed; the first 

 number in brackets following each species is the total number of 

 specimens, and is followed by their registration numbers, then by a 

 reference to any specimens figured here; in a few cases the number 

 of registration numbers quoted is less than the total number of 

 specimens recorded, because specimens were lost, destroyed, poorly 

 preserved, uncollectable (but observed by Bairstow), or too numer- 

 ous to be worth registering all of them. The thickness of each bed is 

 given in the right hand column in metres (m). 



Specimen register numbers are identified here and in the remain- 

 der of the paper by the following prefixes: C. and CA - The Natural 

 History Museum, London; GSM - British Geological Survey (Geo- 

 logical Survey Museum), Keyworth, Nottinghamshire; OUM - 

 Oxford University Museum; SM - Sedgwick Museum, Cambridge; 

 WM - Whitby Museum, Yorkshire. 



