Illinois State Geological Survey 



Report of Investigations No. 97 Plate 1 



CALICULAR PLATFORM CALICULAR BOSS 



CALICULAR PIT 



TABULARIUM 



DISSEPIMENTARIUM 



INVERTED 





\ 



21 



EVERTED COMPLETE 



INCOMPLETE 



SHORT 



LONSDALEOID 



13 



RHOPALOID 



RETIFORM SEPTAL CRESTS 



17 



20 



PERFORATE SEPTAL RIDGES CARINATE YARD-ARM CARINAE HORIZONTAL CARINAS 



1^ 



■ff^25 rV v26 



PERFORATE SEPTAL GRATING ACANTHINE AMPLEXOID SEPTAL FILLETS SEPTAL CONE 



! 23 



