-
Dresbachian is
defined by four
trilobite zones: Cedaria-, Crepicephalus-,
Aphelaspis- and
Dunderbergia trilobite zones.[citation needed] The
Dresbachian extinction...
-
original (PDF) on 2023-08-29.
David R. Schwimmer,
William M. Montante. "An
Aphelaspis zone (Upper Cambrian, paibian)
trilobite faunule in the
central conasauga...
- "Trilobites, Biostratigraphy, and
Lithostratigraphy of the
Crepicephalus and
Aphelaspis zones,
Lower Deadwood formation (Marjuman and
Steptoean Stages, Upper...
- †Anthracospirifer
increbescens †Anthracospirifer
leidyi †Aphelacrinus †
Aphelaspis †
Aphelaspis buttsi †Aphelecrinus †Arborichnus †Arborichnus
repetita †Archimedes...
-
erratica †Ankoura †Ankoura
triangularis †Ankoura
triangularus †
Aphelaspis †
Aphelaspis haguei †Arapahoia †Arapahoia
spathulata †Arapahoia
spatulata †Arcifimbria...
-
turbiniformis †Aphanaia †Aphanaia e**** – type
locality for
species †
Aphelaspis †
Aphelaspis walcotti †Apiculatisporites †Apiculatisporites
microconus †Apiculiretusispora...
- †Anoplotheca
sulcata †Antagmus †Anthracospirifer †Anthracospirifer
leidyi †
Aphelaspis †
Aphelaspis quadrata –
tentative report †Apianurus †Apianurus
barbatus – type...
-
comparable form †
Aphelaspis †
Aphelaspis brachyphasis – type
locality for
species †
Aphelaspis buttsi †
Aphelaspis haguei †
Aphelaspis subditus †Aphelotoxon...
- "Trilobites, Biostratigraphy, and
Lithostratigraphy of the
Crepicephalus and
Aphelaspis zones,
Lower Deadwood formation (Marjuman and
Steptoean Stages, Upper...
- †Anolotichia
ponderosa †Anopliopsis †Anoplotheca †Anoplotheca
concava †
Aphelaspis †
Aphelaspis walcotti – type
locality for
species †Aphetoceras †Aphetoceras oderi...
