GEO^-QGICAL SKETCH MAP Of 



COLUM 

 EaAadlVo 



ipPOST-TERTlARY Gra.ds.Moramcs etc 

 Period of block faulting & differential uplift 



PLIOCENE Mannc5tdim€nh& Gravels 



Trangrtssion in central arco, regression elsewhere 



^^MIOCENE OLIGOCENE Marme 5ed,ment5 



fallowing (after local erosion'Jbmestone 

 marine sediments and basal coaimcaiurcs 

 Widespread transgressions^ slight unconformity 

 i-^ LUCEN L. Marine beds 8, basalcoal meajurcs 

 Erosion interval ond transgression 

 IIUPPER CRETACEOUS DomanLiiTiartone 

 mK Senonian Grcensandetc, basal coalrTieasures 

 iffll-llAlbian marine fced^ (in Koikoura Ranges only) 

 Intense oroofenic movement except in 5 E 

 extremity. Intrusion of- oranite and ba^ic 

 rocks and perhaps of dioritcs inSW 

 P X tl G r a o I te . 



Peridotite , Gabbro, Worite etc 

 DWER CRETACEOUS' c^reywacHes, 



^ [ upper 1 Marine (/reykvackes and 

 =c/Midd|e> conglomerates with 'plant beds 

 3\Lgwcr_] and thin coal seams. 

 ^ Rhaetic marine gttywade Si plant beds 

 one ^rey wache limestone^ basic tuffs 

 Cgrnic greywackes with extensive pauna 

 Unfossiiifcrous greywackts. 

 Possifc/e trcat( in scijuence of un known extent 

 Various authoritiesclaim complete confon-nity_ 

 minor regress lon^ or ^reat orogeny with 

 intrusion of Jneissic diorites. 

 ^LOWERTRIASSlC'AnnelldGreywacke 

 ^PERMIAN GreywocckUestone. basfc tu/f. 

 ^^ Quartz- Schists etc of Central Otago 

 \^ Probably altered form of the above. 

 Conditions of this intervol unknown. 

 ^ UPPER SILURIAN Ree/ton and 

 iiiil Baton River Series. 

 Probably stronj unconformity. 

 IpfLOWERORDOVICIAIV Aorere Series 

 Eililpassinj into(') schists & paragneiss. 



^5 DIORlTt More or less g 



^^ certain. Palaeozoic Triassic or in prt Cretaceous 



Fig. I 



Correction: Insert ? after "Erosion interval" between EOCENE and UPPER 

 CRETACEOUS in section above. 



