between the end of March and early April 1978 (Fig. 23) . These results 

 corroborate those of Roussel and Gautier at Antifer . ( 1979) . 



PORTSUl 22.3.78 



P0RT55LL 23.3.73 



GUISSEHY 23.3.. 78 



ROSCOFF 3.4.73 



PORTSALL 4.4.78 



/ G'JISSENY 4.4.78 



BRIG'iOGV* 4.4.7c 



1 1 1 



3600 3200 2600 



n 



1700 1600 



— I — 

 1100 



750 cm 



FIGURE 23. Infra-red spectrometry of samples of crude 

 (R 340+) and extracts. 



136 



