no 



CAMBRIAN BRACHIOPODA. 



SUMMARY OF CAMBBIAN BRACHIOPODA. 



The distribution of the Cambrian Brachiopoda is summed up in three tables. The first 

 (pp. 110-111) gives the general geographic and stratigraphic distribution of the genera; the 

 second (p. 112) gives the same information for the families; and the third (p. 112) is a summary 

 of the Cambrian Brachiopoda by genera and species. 



Summary of Cambrian Brachiopoda by genera. 



a Two species pass up from the Lower to the Middle Cambrian, four from the Middle to the Upper Cambrian, and one from the Lower to 

 the Upper Cambrian. One species is common to the Lower, Middle, and Upper Cambrian. One variety passes from the Lower to the Middle 

 Cambrian. 



b Fourteen species pass from the Middle to the Upper Cam.brian and one continues into the passage beds. Four of these species pass up 

 from the Upper Cambrian to the Ordovician. 



c One species is common to the Lower, Middle, and Upper Cambrian, and one species passes from the Middle to the Upper Cambrian. One 

 species passes from the Upper Cambrian to the Ordovician. 



d Two species are common to the Middle and Upper Cambrian and pass up Into the Ordovician; eleven species pass from the Middle to the 

 Upper Cambrian; two species pass from the Upper Cambrian to the passage beds; and two species pass from the Upper Cambrian to the Ordovician. 



e Two species are common to the Middle and Upper Cambrian and pass up into the Ordovician. 



/ One species is common to the Middle and Upper Cambrian; two species pass from the Middle to the Upper Cambrian; and one species 

 passes from the Upper Cambrian to the Ordovician- 



