104 A. E. Trueman — The Lias of South Lincolnshire. 



ft. in. 

 Dark-grey micaceous shales with ferruginous con- 

 cretions in beds and scattered. Amaltheus spp. 

 (common) . Oistoceras spp. and ' ' Androgynoceras ' ' 

 spp. (decreasing towards the upper part). Modiola 

 subcancellata, Gonimnya liybrida, Cucullea 

 viiinsteri, Gresslya spp., Pecten spp. . . . 15 Q 



Oistoceras Dark-grey shales with reddish pyritic nodules, con- 

 sub-zone, taining Oistoceras figulinum, 0. omissimi, 0. 

 Liparoceras cxirvicornum, ^^ Androgynoceras^^ capricornum 

 sub-zone, (Wright), Amblycoceras crescens, Beaniceras &S. 

 and luridum, Lytoceras sp., Gresslya spp., Leda 

 latcBcosta {Nuculana) spp. . . . . . . . 15 



sub-zone. Dark-grey clunchy clay with nodules and two shell 

 beds, with Capricorn ammonites, Gresslya lunulaia, 

 Pecten spp., Pleuromya granata, Cucullea sp., 

 Plicat^ila spinosa . . . . . . 10 0' 



Dark-grey shales with scattered nodules. Capricorn 

 ammonites less common, Androgynoceras cf. 

 ^'striatuvi", Lytoceras Gi.lineatus,'Wt. (nonSchl.), 

 very abundant. Gonioniya hybrida, Pecten cequi- 

 valvis, P. calvus . . . . . . . 10 



(The bottom 20 feet was examined during the construction of 

 a reservoir at the northern end of the pit in 1917 and is not now 

 visible.) 



The most remarkable feature of the fauna is the abundance and 

 variety in the Oistoceras sub-zone of the Capricorn ammonites, which 

 with the " sphserocones" or " striatiitn " -like forms evolved, from 

 them pass into the lower ^yart of the tnafyaritatus zone. Thus species 

 of Amaltheus and Oistoceras may be collected in the same bed up to 

 within fifteen feet of the base of the spinatum zone. This feature 

 does not seem to occur except around Lincoln, and possibly in North 

 Lincolnshire, where Ussher ' found Capricorn ammonites only ten feet 

 below the Marlstone rock bed [spinatum zone). " Anun. striatum'* 

 was recorded at Bracebridge by the Survey, but the ammonite 

 usually known by this name occurs much lower in the sequence ; 

 the forms found at Lincoln previously included under that name are 

 the sphaerocone stages of Amhit/coceras, Oistoceras, and A7idrogyno- 

 ceras. It is hoped that these will be described shortly. 



The section to be examined at the Albion Brickworks (formerly 

 Handley's Pit) one mile north of the Lincoln Cathedral, shows 

 a faunal succession which does not differ from that seen at Brace- 

 brid<ie, but there are some interesting differences in the lithology of 

 the spinatum zone and the overlying Transition Bed. 

 Section at the Albion Beickwoeks. 



tenuicostatimi 



sub-zone. 

 acutum sub- 

 zone, 2ft. 6in. 



Paper shales, weathered red and orange 



ft. in. 

 15 



Greenish shale with Tiltoniceras and Dactylioceras 

 athleticum ........ 



Ferruginous sandstonewith Dactyloids (D. athleticum, 

 D. cf. tenuicostatum, D. semicelatum, Cceloceras 

 cf . fonticulum) ....... 



^ A. E. Ussher, Geology of North Lincolnshire, etc. (Mem. Geol. Surv.), 

 1890, p. 49. 



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