io6 



We have here to deal with a heavy series of early Devon- 

 ian limestones and lime shales unconformable to and over- 

 thrust upon the Cambro-Ordovician slates exposed at the 

 north. The upper limestones, facing the south, are 

 exceedingly rich in fossils, but the exposures are for the 

 most part to be found on the little crescentic fishing beaches 

 where the sea has cut out joint blocks of the strata. The 

 thrust plane or base of the Devonian series has not yet 

 been observed though further exploration may reveal it at 

 the north base of the sea cliffs. 



Starting from Grande Greve beach the section of the 

 rocks is approached in reversed order, from top to bottom. 

 Here and along all the neighboring beaches the upper 

 strata of fossil-bearing Grande Greve limestones are 

 exposed and actual unconformable contact of the upper- 

 most beds with the red plant-bearing Gaspe sandstone 

 is to be seen at Little Gaspe if miles (2-4 km.) westward 

 on the shore. The division of the total limestone series 

 (St. Alban, Bon Ami and Grande Greve) is as yet a broad 

 one based upon lithologic and faunal rather than diastro- 

 phic characters. The upper member of this series or 

 Grande Greve limestone is also divisible on the basis of 

 its fuana, into distinctive early and late elements, but 

 taken as a whole the species of the Grande Greve member 

 are eminently characteristic of the Helderberg-Oriskany 

 with a considerable representation suggestive of incipient 

 stages of the later Onondaga fauna of the New York stan- 

 dard. A total fauna of 155 species has been described 

 from the Grande Greve limestone and a visitor may 

 expect to find in the upper beds characteristic species of 

 the trilobites Phacops (logani, gaspensis), Dalmanites (pha- 

 coptyx, dolbeli, emarginatus, etc.), Probolium, Cordania, 

 Lichas and Gaspelichas; the cephalopods, Kionoceras 

 and Orthoceras; the pteropods Hyolithus and Contdaria; 

 abundant gastropods of the genera Platyceras, Eotomaria 

 and Diaphorostoma; the pel ecy pods Pterinea, Megam- 

 bonia, Palaeopinna, etc. ; a large array of brachiopods, 

 Spirifer arenosus, murchisoni and many more, Rhipi- 

 domella logani, Stropheodontas and Leptostrophias, Lepto- 

 coelia flabellites, Nucleospira, Rensselceria ovoides gas- 

 pensis, Megalanteris, etc., etc. A very notable percentage 

 of these species have a wide geographical rang and the 

 affiliation of the fauna is distinctly American 



