TABULAR SUMMARY OF PALEOZOIC LIFE 



Permian 



Pennsyl- 

 vania^ 



Mississip- 



PIAN 



Thallophytes. 



Bryophytes. 



Pteridophytes: Cul 

 minate, e.g. Ly co- 

 pods, Equisetae and 

 Ferns. 



(Seed-ferns) . 



Gymnosperms: Sim- 

 ple ones common 

 e.g. Cordaites. 



Thallophytes. 



Bryophytes. 



Pteridophytes: Com- 

 mon and much like 

 Devonian. 



(Seed-ferns) . 



Gymnosperms : Simple 

 types only present. 



Devonian 



Silurian 



Ordovician 



Cambrian 



Plants 



Thallophytes. 



Bryophytes. 



Pteridophytes: Ly- 

 copods reduced; 

 Equisetae and Ferns 

 prominent. 



Gymnosperms: Com- 

 mon, e.g. Cycads. 

 Cordiates, Conifers. 



Thallophytes : Sea- 

 weeds and Diatoms 



Bryophytes? 



Pteridophytes: Ly co- 

 pods, Equisetae, and 

 Ferns. 



(Seed-ferns). 



Gymnosperms: Sim- 

 ple types only. 



Thallophytes: Sea- 



Bryophytes? 



Pteridophytes: 

 Ferns, but rare. 



Thallophytes: 

 Sea-weeds. 



Higher Cryptogams' 



Thallophytes: 

 Algae. 



Protozoans 



Foraminifers: 

 Very common. 



Radiolarians: 

 Present.. JV- 



<^ 



Foraminifers : 

 Very abun- 

 dant. 



Radiolarians: 

 Present., \X* 



- 



I V-- \jJ> 







Foraminifers : 

 Very *bun- , 



dantJr..' 



If. 



Radiolarians: 

 Common. 



Sponges: Common 

 Graptolites: Very 

 rare and become ex- 

 tinct. 

 Corals: Cup and 

 Honey-comb forms 

 only, and less prom- 

 inent than in the 

 Devoniajrff -£ 



Foraminifers: 

 Present. 



Radiolarians : 

 Present. 



Foraminifers: 

 Present. 



Radiolarians: 

 Present. 



Foraminifers: 

 Abundant. 



Radiolarians: 

 Abundant. 



Foraminifers: 

 Present. 



Porifers and 

 Ccelenterates 



Sponges: Present. 



Corals: Ancient Te- 

 tracoralla still com- 

 mon, but first Hex 

 acoralla appear. 



Sponges: Present. 



Corals: Similar to 

 Mississippian but 

 dess common. 



1 



Sponges: Common. 



Graptolites: - Decline 



almost to extinction. 



Corals: Cup and 

 Honey-comb forms 

 greatly increased in 

 numbers and size 

 Chain corals rare 

 and become extinct 



Sponges: Common. 



Graptolites: Dimin 

 ished in numbers 

 and species. 1fy/?*'0 



Corals: Increase in 

 prominence and 

 Chain-corals be- 

 come nearly extinct 



Sponges: Very com- 

 mon. 



Graptolites: Reach 

 climax in numbers 

 and species. 



Corals: Common e.g. 



Cup, Honey-comb 



and Chain forms. 





Spofiges: Comh%dfi7 

 Hydrozoans : Grap- 

 tolites and Jelly- 

 fishes, both com 



Corals: Present? 



Echinoderms 



Crinoids: Greatly di- 

 minished. 



Asterozoans: 

 ent. 



Pres- 

 Echinoids: Present. 



Blastoids: Become 

 extinct. 

 Crinoids: Declining. 



Asterozoans: Pres- 

 ent. 



Echinoids: Rare. 



Blastoids: Culminate 

 and become nearly 

 extinct. 



Crinoids: Culminate 

 in numbers and spe- 

 cies. 



Isterozoans: Not 

 common. 



Echinoids: Common. 



Cystoids: Rare and 

 become extinct. 



Blastoids: Still un- 

 common. 



Crinoids: Still in- 

 creasing. 



Asterozoans: Abun- 

 dant. 



Echinoids: Present. 



Cystoids: Prominent. 



Blastoids: Still rare. 



Crinoids: Increase in 

 numbers and species. 



Asterozoans and 

 Echinoids: Increase. 



Cystoids: Culminate. 



Blastoids: First ap- 

 pear and rare. 



Crinoids: First ap- 

 pear and common. 



Asterozoans and 

 Echinoids: First ap- 

 pear and rare. 



Cystoids: Primitive 

 forms and rare. 



C^lA) 



v- 



*3" 



1 



L^ ^ 



