Adam's Ordovician.
- amplexopora
- amplexopora septosa
- ampyx
- ampyx priscus
- anti-atlas
- anti atlas
- arenig
- arnheim formation
- asaphid
- asaphus
- asaphus expansus
- asaphus fallax
- asaphus latus
- asaphus lepidurus
- ascocystites
- ashgill
- ashgill shales
- atactoporella
- atactoporella peculiaris
- atactoporella schucherti
- athyrid
- athyridida
- australia
- baltoscandinavia
- baota formation
- batostoma
- batostomella
- batostomella gracilis
- beekite
- bendigo
- bendigonian
- beroun
- bou nemrou
- bryozoa
- bryozoan
- bullengarook
- bumastoides
- calymene
- calymenid
- calymenina
- campylorthis
- campylorthis deflecta
- canada
- caradoc
- caradocian
- castlemainian
- catazyga erratica
- china
- cincinnatian
- cincinnati group
- colphocoryphe grandis
- colpocoryphe
- colpocoryphe aragoi
- colpocoryphe lennieri
- colpocoryphe rouaulti
- colpocoryphe thorali
- coniston
- constellaria
- constellaria antheloidea
- constellaria florida
- cornulites
- cross fell
- cumbria
- cummingsville formation
- cyathophylloides
- cyathophylloides stellata
- czechia
- czechoslovakia
- czech republic
- dalmanella
- dalmanella testudinaria
- dalmantina
- dalmantina socialis
- decorah
- decorah formation
- decorah shale
- ded
- ded hill
- dendroid
- dermatostroma
- dermatostroma scabrum
- diacalymene
- dictyonema
- dictyonema flabelliforme
- didymograptus
- didymograptus extensus
- didymograptus protobifidus
- drakes formation
- dufton shales
- dunleith formation
- early ordovician
- edrioasteroid
- el caid errami
- el kaid errami
- el qaid errami
- england
- eocrinoid
- erfoud
- etobicoke creek
- fairmount member
- fairview formation
- favistina
- favistina stellata
- favositella
- favositella laxata
- favosites
- favosites fibrilla
- favositida
- fezouata formation
- fillmore county
- first bani group
- fisherites
- fisherites reticulatus
- flatfork creek
- flexicalymene
- flexicalymene ouzregui
- flexicalymene retrorsa
- foerstephyllum
- foerstephyllum vacuum
- fossil
- fossils
- france
- galena group
- georgian bay formation
- gisborne
- graf
- grant county
- graptolite
- gravicalymene
- greenleafton
- grewingkia
- grewingkia canadensis
- gulhogen
- hallopora
- hesperorthis
- hesperorthis tricenaria
- heterotrypa
- heterotrypa subfrondosa
- hindella
- hindella crassa
- hindella crassa incipiens
- hirnantia
- hirnantian
- hirnantia sagittifera
- hormotoma
- huk formation
- humber member
- indiana
- iowa
- ischadites
- ischadites circularis
- isograptus
- isograptus caduceus
- isograptus victoriae
- isorthoceras
- isorthoceras sociale
- izzegguirine formation
- kentucky
- khouribga
- kinnekulle
- kirkfeldian
- koporie
- koporye
- ktaoua formation
- kunda stage
- lambeophyllum
- lambeophyllum profunda
- lambeophyllum profundum
- late ordovician
- lawrenceburg
- lepidurus formation
- leptaena
- leptaena rugosa
- letna formation
- lilydale
- lituites
- lituites lituus
- ljungsbro
- llandeilo
- llanvirn
- lower ordovician
- lycophoria
- lycophoria nucella
- lycophoriidae
- maquoketa formation
- maysville
- maysvillian
- mesotrypa
- mesotrypa distincta
- middle ordovician
- mifflin
- mimico creek
- minnesota
- missisauga
- monotrypa
- morocco
- mount auburn formation
- mount orab
- mt. orab
- nashville
- nautiloid
- nicolella
- nicolella actoniae
- norway
- oepikina
- oepikina minnesotensis
- ohio
- old man of coniston
- ontario
- ordovician
- orthid
- orthida
- orthocerid
- orthocerida
- orthocone
- oslo
- ostergotland
- ouled slimane
- pachydictya
- pagoda formation
- paratetragraptus
- paratetragraptus approximatus
- parvohallopora
- parvohallopora ramosa
- parvohallopora rugosa
- parvohallopora subplana
- paucicrura
- paucicrura corpulenta
- pennines
- petraster
- petrocrania
- petrocrania scabiosa
- phyllograptus
- phyllograptus angustifolius
- phyllograptus titus
- pionodema
- pionodema conradi
- pionodema subequata
- platteville
- platteville formation
- platystrophia
- platystrophia amoena
- platystrophia biforata
- platystrophia biforatus
- platystrophia ponderosa
- platystrophia trentonensis
- portugal
- postville
- prague
- prague basin
- prasopora
- prasopora grandis
- prasopora simulatrix
- preachersville member
- rafinesquina
- rafinesquina alternata
- rafinesquina ponderosa
- raphiophoridae
- receptaculitid
- rhabdinopleura
- rhabdinopleura flabelliformis
- rhynchotrema
- rhynchotrema ainsliei
- rhynchotrema laticosta
- rhynchotrema minnesotensis
- rhynchotrematidae
- rhynchotrema wisconsinense
- richmondian
- rochester
- rostricellula
- rostricellula minnesotensis
- rugosa
- rugose coral
- russia
- sandbian
- sarcinulida
- slemmested
- sowerbyella
- sowerbyella curdsvillensis
- sowerbyella minnesotensis
- sowerbyella punctostraita
- sowerbyella sericia
- spain
- spinadiscus
- spinadiscus lefebvrei
- st.pauls
- st. pauls brickyard
- starfish
- stewartville
- stewartville formation
- stictopora
- stictoporellina
- stictoporellina cribrosa
- stigmatella
- stigmatella personata lobata
- stigmatella vulgaris
- streptelasma
- streptelasma aequisulcatum
- streptelasma corniculum
- strophomena
- strophomena filitexta
- strophomena pattinensis
- strophomena septata
- strophomenid
- sweden
- tabulata
- tabulate coral
- tennessee
- tentaculitid
- tentaculitida
- tetragraptus
- tetragraptus serra
- tiouririne formation
- toronto
- tremadoc
- trepostomata
- trepostomes
- treptoceras
- treptoceras crebriseptum
- tretaspis
- tretaspis seticornis
- trigonirhynchiidae
- trilacinoceras
- trilacinoceras hunanense
- trilobite
- trinucleid
- tshallograptus fruiticosus
- tshallograptus tridens
- upper fezouata formation
- upper ordovician
- usa
- vastergotland
- versaille
- victoria
- vinlandostrophia ponderosa
- vinlandstrophia
- warren county
- whitewater formation
- williamson county
- wisconsin
- zagora
- zygospira
- zygospira erratica
- zygospira modesta
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