|  
                
                   
                    | Redlichiida 
                        Trilobite Fossils |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Olenellidae | Family
                        Nevadiidae  | Family
                        Olenellidae  |  Family
                        Olenellidae |   
                    | Pioche 
                        Shale Formation, Nevada |  Campito
                        Formation, Nevada |  Pioche
                          Shale Formation, Nevada
 | Kinzer
                        Formation, Pennsylvania  |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Redlichiidae | Family 
                        Nevadiidae | Family 
                        Redlichiidae | Family 
                        Redlichiidae |   
                    | Guanshan 
                        Fauna, Wulongqing Formation, China |  Campito
                        Formation, Nevada | Guanshan 
                        Fauna, China | Guanshan 
                        Fauna, China |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Olenellidae | Family 
                        Olenellidae | Family 
                        Chenkouaspidae | Family Fallotaspidoidea |   
                    | Pioche 
                        Shale Formation, Nevada | Pioche 
                        Shale Formation, Nevada | Kaili 
                        Formation, China | Campito Formation, Nevada |  
                    |  |  |  |  |  
                    |  |  |  |  |  
                    | Family
                          Olenellidae |  |  |  |  
                    | Latham
                          Shale Formation, Marble Mountains, California |  |  |  |   
                    | Phacopid 
                        Trilobite Fossils   |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    |   |  Family 
                        Asteropyginae | Suborder 
                        Cheirurina | Superfamily 
                        Acastoidea  |   
                    |   | Hamilton 
                        Group, New York | St 
                        Petersburg, Russia | Alnif, 
                        Morocco |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Tinucleidae | Family 
                        Phacopidae | Family 
                        Phacopidae | Family 
                        Cheiruridae |   
                    | Zagora, 
                        Morocco | Silica 
                        Shale Formation, Ohio | Hamilton 
                        Group, New York | Trenton 
                        Group, Quebec, Canada |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Pliomeridae | Family 
                        Pliomeridae | Family 
                        Damanitidae | Family 
                        Acastidae |   
                    | Ninemile 
                        Shale, Eureka County, Nevada | Fillmore 
                        Formation, Utah
 | Calzada 
                        de Calatrava, Spain | Foum 
                        Ziguid, Morocco |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Subfamily 
                        Asteropyginae | Subfamily 
                        Asteropyginae | Family 
                        Encrinuridae | Family 
                        Calymendae |   
                    | Alnif, 
                        Morocco | Moscow 
                        Formation, New York | Xiushang 
                        Formation, China | Ontario, 
                        Canada |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Calymenidae | Family 
                        Cheiruridae | Family 
                        Calymenidae | Family 
                        Acastoidea |   
                    | Rochester 
                        Shale, New York | Dra 
                        Valley, Morocco | Rose 
                        Hill Formation, West Virginia | Timrhanrhart 
                        Formation, Morocco |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family
                          Dalmanitidae | Family
                          Cheiruridae | Family
                          Phacopidae | Family
                          Acastidae |   
                    |  | Walcott – Rust
                          Quarry, New York |  | Oued
                          Ghris, Alnif, Morocco |  
                    |  |  |  |  |  
                    |  |  |  |  |  
                    | Family Acastidae | Family
                          Acastidae | Family
                          Phacopidae  | Family
                          Acastidae |  
                    | Issimour, Alnif, Morocco | Ofaten, Morocco | Issimour,
                          Alnif, Morocco | Ofaten,
                          Morocco |  
                    |  |  |  |  |  
                    |  |  |  |  |  
                    | Family
                            Dalmanitidae | Family Cheiruridae |  |  |  
                    | Valongo
                            Formation, Covelo, Portugal | Oufaten, Alnif, Morocco |  |  |   
                    | Agnostid 
                        Trilobite Fossils |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Ptychagnostidae | Family 
                        Ptychagnostidae | Family 
                        Weymouthidae  | Order 
                        Agnostida  |   
                    | Burgess 
                        Shale, Stephen Formation, BC, Canada | Marjum 
                        Formation, Millard County, Utah |  Flinders 
                        Ranges, South Australia | Marjum 
                        Formation, Utah  |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Ptychagnostidae | Family 
                        Ptychagnostidae |  |  |   
                    | Marjum 
                        Formation, Millard County, Utah | Burgess 
                        Shale, Stephen Formation, BC, Canada |  |  |   
                    | Ptychopariida 
                        Trilobite Fossils |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Families 
                        Cedariidae & Marjumiidae | Family 
                        Uncertain | Family 
                        Marjumiidae | Family 
                        Marjumiidae |   
                    | Weeks 
                        Formation, Utah | Weeks 
                        Formation, Utah | Weeks 
                        Formation, Utah | Marjum 
                        Formation, Utah |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Alokistocaridae | Family 
                        Menomoniidae | Family 
                        Llanoaspididae | Family
                              Olenidae |   
                    | Wheeler 
                        Formation, Utah | Weeks 
                        Formation, Utah | Weeks 
                        Formation, Utah | Lorraine
                            Shale, Lewis County, New York |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Alokistocaridae | Family 
                        Lonchocephalidae | Family 
                        Asaphiscidae | Family 
                        Ptychopariidae |   
                    | Pierson 
                        Cove Formation, Utah | Weeks 
                        Formation, Utah | Wheeler 
                        Formation, Utah | Chisholm 
                        Shale, Nevada |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    |  Family 
                        Olenidae | ? | Family
                          Olenidae | Family
                          Ptychopariidae |   
                    | Trinity 
                        Bay, Newfoundland | Cranbrook,
                          British Columbia | Cordillera
                          Formation, Argentina | Marjum
                          Formation, Utah |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family
                          Palaeoleniodae  | Family 
                        Proasaphiscidae | Family
                          Olenidae | Family Tricrepicephalidae |   
                    |  | Siberia, 
                        Russia |  Lorraine
                          Shale, New York | Weeks Formation, Utah |  
                    |  |  |  |  |  
                    |  |  |  |  |  
                    | Family
                          Menomiidae |  |  |  |  
                    |  Wheeler
                          Formation, Utah |  |  |  |   
                    | Lichida 
                        Trilobite Fossils |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    |  Family 
                        Odontopleuridae |  Family 
                        Odontopleuridae | Family 
                        Lichidae  | Family 
                        Odontopleuiridae  |   
                    |  Alnif, 
                        Morocco |  |  | New 
                        South Wales, Australia  |   
                    |  |  |  |  |  
                    |  |  |  |  |  
                    |  Family
                            Odontopleuridae | Family Odontopleuridae | Family Odontopleuridae |  |  
                    |  |  Alnif,
                            Morocco | Kopaninske Formation, Czech
                        Republic |  |   
                    | Asaphid 
                        Trilobite Fossils    |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Asaphidae; Subfamily Isotelinae  |  Family 
                        Asaphidae |  Family 
                        Asaphidae  | Family 
                        Trinucleidae  |   
                    |  Ontario, 
                        Canada | Criner 
                        Hills, Oklahoma  |  Wenlock 
                        Shale, UK | Blekos, 
                        Morocco  |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Asaphidae | gen 
                        et sp indet | Subfamily 
                        Ptyocepalinae | Family 
                        Asaphidae |   
                    | St 
                        Petersburg, Russia | Jbel 
                        Bani, Morocco | Fillmore 
                        Formation, Utah | Walcott 
                        – Rust Quarry, New York |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Trinucleidae | Family
                          Trinucleidae | Family
                          Trinucleidae |  |   
                    | Llanvirn 
                        Series, Wales | Czech
                          Republic | Ourzazate,
                          Morocco |  |   
                    | Proetid 
                        Trilobite Fossils    |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    |  Family 
                        Otarionidae |  Family 
                        Aulacopleuridae | Family 
                        Aulacopleuridae  | Family 
                        Proetidae  |   
                    |  DevonianAlnif, Morocco
 |  Wenlock 
                        Shale, Dudley, England |  Liten 
                        Formation, Czech Republic |  Staunton 
                        Formationm, Indiana |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    | Family 
                        Brachymetopidae |  | Family
                          Phillipsiidae  | Family
                          Proetidae |   
                    | Rochester 
                        Shale Formation, New York | Alnif, 
                        Morocco | Chouteau
                          Formation, Missouri | Ludlowville,
                          New York |   
                    | Harpetid 
                        Trilobite Fossils    |   
                    |  |  |  |   |   
                    |  |  |  |   |   
                    | Family 
                        Harpetidae  | Family
                          Harpetidae  |  Family
                          Harpetidae |   |   
                    |  Hamar 
                        Laghdad Formation, Morocco | Boudib,
                          Morocco  | Laatchana,
                          Morocco  |   |   
                    | Corynexochida 
                        Trilobites  |   
                    |  |  |  |  |   
                    |  |  |  |  |   
                    |  Family 
                        Dolichometopidae |  Family 
                        Dorypygidae |  Family 
                        Dorypygidae | Family
                          Oryctocephalidae |   
                    |  Marjum 
                        Formation, Utah |  Marjum 
                        Formation, Utah | Pierson 
                        Cove Formation, Drum Mountains, Utah | Hotang
                          and Dachenling Formations, China |  
                    |  |  |  |  |  
                    |  |  |  |  |  
                    |  Family
                          Scutellidae | Family
                          Thysanopeltidae | Family
                          Zacanthoididae | Family
                          Thysanopeltidae  |  
                    | Laatchana, Morocco | Hamar
                          Laghdad,  Morocco
 | Gordon
                          Shale, Montana | Alnif,
                          Morocco |  
                    |  |  |  |  |  
                    |  |  |  |  |  
                    | Family
                          Dolichometopidae | Family
                          Dolichometopidae | Family
                          Styginidae |  |  
                    | Meagher
                          Shale, Montana | Marjum
                          Formation, Utah | Foum
                          Ziguid, Morocco |  |  |