526 



Table B. — Vertical Range of tlie Zones of Br it i sit, Graptoloidea. 

 Monograpli, 1913. 



Memoir, 1879-80. 



Graj)tolite Zones and 

 Suh-zones. 



36 

 35 

 34 

 33 

 32 



Zone of Monograptus leintwardinensis 



„ „ tumescens 



i> » 



scanicus 



>r » 



Nilssoni 



» » 



vulgatus 



31 

 30 

 29 



28 

 27 

 26 



Cyrtograptxis Liindgreni 



rigidus 



Linnarssoni 



symmetricus 



Monograptus riccartonensis 



Cyrtograptiis Murchisoni 



Graptolite Zones and 

 Horizons. 



20 I Monograptus Nilssoni 



i 



19 ! Monograptus testis 



Stratigra/ihical 

 Nomenclature. 



M 



o 



18 



17 



Cyrtograpttis Linnarssoni 



Cyrtograptus Murchisoni 



25 

 24 

 23 



22 i 



21 



2oi 



19 



18 

 17 



16 



Monograptus crenulatus 



griestoniensis 



cnspus 



„ tnrriculatus 



Band of Monog. (Bast.) maximiis 



Zone of M. Sedgu-iclci 



Band of Cephalograptus cometa 

 Zone of Monograptus convolutvs 

 Zone of Monograptus gregarius 

 (c) Sub-zone of M. argeniens 

 (6) „ M. triangulatiis 



(c) „ M. fimhriatus 



Zone of Monograptus cyphus 



Mesograptus modestiis and Urthog. 

 vesiculosus 



Cephalograptus arutninatu.t 



16 



15 



14 

 13 



yi2 



11 



10 



Cyrtograptus Grayi 

 Monograptus exiguns 



}ll. 



Rastrites maximus \ 



Monograptus spinigerus(Sedg- \ S 

 wicki) (Sub-zone of Cepha- 



log. cometa) ^ 





Monograptus gregarius 



\J 



Diplograptus vesiculosus 

 Diplograptus acuminatus 



■ « 



/ 



15 

 14 

 13 

 12 

 11 



10 



Zone of Dicellograptus anceps 



Dicellograptus complanatus 



Pleurograptvs linearis 



Dicranograptus Clingani 



Climacograptus Wilsoni 



9 

 8 

 7 

 6 

 6-5 



Climacograpius peUifer and Meso- 

 graptus muUidens 



„ Nemagraptvs 



gracilis 



,, Glyptograptus teretiusculus 



„ Didymograpt 



IIS Murchisoni 



,, ,, hifidus 



>t 3> 



hirundo 



„ „ extensus 



Bichograptus 



Dicellograptus anceps 



„ corij)lanatus 



Pleurograptus linearis 

 Dicranograptus Clingani 

 (zone of C. Wilsoni) 



Canograptus gracilis 



Didymograptus Murchisoni 





-lire 



Jos 



1^ 



03 



p, 



p 



hifidus 



Tetragraptus hryonoides 



Bryograptus 



Dictycnema sociale 



Bryograptus Callavei 







I? 



vol. V, 1881, pp. 302-303) 



Journ. Geol. Soc.,' 1905, vol. Ivi, 



his Llandcilian the Zones 



