† Problematica

Automatic Links to external internet sources (Responsibility is with the operator)

Search for taxonomy at PaleobioDB.org

Search for taxonomy at Fossilworks

Search for taxonomy at The Taxonomicon

• P. J. Wagner, 2020 - Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database (2006 - 2020) - (), - (compendium, English)

• Y. Cai, 2019 - Diverse biomineralizing animals in the terminal Ediacaran Period herald the Cambrian explosion - Geology (47), - (journal article, English)

• C. B. Skovsted, 2018 - Mobergellans from the early Cambrian of Greenland and Labrador: new morphological details and implications for the functional morphology of mobergellans - Journal of Paleontology (92), 71-79 (journal article, English)

• N. I. Schroeder, 2018 - Eldonioids with associated trace fossils from the lower Cambrian Emu BayShale Konservat-Lagerstätte of South Australia - Journal of Paleontology (92), 80-86 (journal article, English)

• G. Burzynski, 2017 - The ins and outs of Ediacaran discs - Precambrian Research (300), 246-260 (journal article, English)

• Yu. E. Demidenko, 2016 - Morphology, Taxonomic Position, and Stratigraphic Distribution of the Early Cambrian Skeletal Problematics Mobergella radiolata Bengtson, 1968 - Paleontological Journal (50), 435-449 (journal article, English)

• C. Peybernes, 2015 - Upper Triassic (Ladinian?-Carnian) reef biota from the Sambosan Accretionary Complex, Shikoku, Japan - Facies (61), - (journal article, English)

• F. Zhao, 2013 - Diversity and species abundance patterns of the early Cambrian (Series 2, Stage 3) Chengjiang Biota from China - (), - (journal article, English)

• D. Y. Huang, 2012 - The homonymy of Xishania with reference to Xishania fusiformis Hong, 1981 and X. longiusula Hu, 2002 - Acta Palaeontologica Sinica (51), 102-106 (journal article, English)

• D. F. Lazar, 2012 - Sedimentary succession of the Lower Cretaceous deposits from the north-western part of Pădurea Craiului (Apuseni Mountains, Romania) - Studia UBB Geologia (57), 33-51 (journal article, English)

• B. Senowbari-Daryan, 2012 - Upper Triassic (Carnian) reef biota from the Sambosan Accretionary Complex, Kyushu, Japan - Facies (58), 671-684 (journal article, English)

• D. H. Erwin, 2011 - The Cambrian Conundrum: Early Divergence and Later Ecological Success in the Early History of Animals - Science (334), 1091-1097 (journal article, English)

• A. Kouchinsky, 2011 - A middle Cambrian fauna of skeletal fossils from the Kuonamka Formation, northern Siberia - Alcheringa (35), 123-189 (journal article, English)

• Q. Feng, 2010 - Mid-Late Devonian calcified marine algae and cyanobacteria, south China - Journal of Paleontology (84), 569-587 (journal article, English)

• P. Y. Parkhaev, 2010 - Zooproblematica and mollusca from the Lower Cambrian Meishucun section (Yunnan, China) and taxonomy and systematics of the Cambrian small shelly fossils of China - Paleontological Journal (44), 883-1161 (journal article, English)

• B. A. MacGabhann, 2010 - Non-mineralised discoidal fossils from the Ordovician Bardahessiagh Formation, Co. Tyrone, Ireland - Irish Journal of Earth Sciences (28), 1-12 (journal article, English)

• A. Kouchinsky, 2009 - The Lower Cambrian fossil Anabaritids: affinities, occurrences and systematics - Journal of Systematic Palaeontology (7), 241-298 (journal article, English)

• B. Senowbari-Daryan, 2009 - Carnian (Upper Triassic) reef biota from limestone blocks of different tectonic settings in the Oman Mountains - Beringeria (40), 3-53 (journal article, English)

• B. Senowbari-Daryan, 2009 - Coralline Schwämme aus dem norisch-rhätischen Dachstein-Riff des Gosaukammes (Nördliche Kalkalpen, Österreich) [Coralline sponges from the Norian-Rhaetian Dachstein Reef of the Gosaukamm (Northern Calcareous Alps, Austria)] - Jahrbuch der Geologischen Bundesanstalt (149), 111-166 (journal article, German)

• T. Wotte, 2009 - The youngest cambroclaves: Cambroclavus absonus from the Middle Cambrian of the Cantabrian Zone (Northwest Spain) - Journal of Paleontology (83), 128-134 (journal article, English)

• H. J. Hofmann, 2008 - Ediacaran biota on Bonavista Peninsula, Newfoundland, Canada - Journal of Paleontology (82), 1-36 (journal article, English)

• C. B. Skovsted, 2007 - Small shelly fossils from the argillaceous facies of the Lower Cambrian Forteau Formation of western Newfoundland - Acta Palaeontologica Polonica (52), 729-748 (journal article, English)

• R. K. Bambach, 2007 - Supplement to Autecology and the filling of ecospace: Key metazoan radiations - Palaeontology (50), 1-22 (journal article, English)

• M. A. Fedonkin, 2007 - The rise of animals: Evolution and diversification of the Kingdom Animalia - The Johns Hopkins University Press, Baltimore, MD (), 1-326 (compendium, English)

• G. Li, 2007 - Early Cambrian metazoan fossil record of South China: Generic diversity and radiation patterns - Palaeogeography, Palaeoclimatology, Palaeoecology (254), 229-–249 (journal article, English)

• M. Streng, 2006 - A new mobergellan (small shell fossils) from the early Middle Cambrian of Morocco and its significance - Paläontologische Zeitschrift (80), 209-220 (journal article, English)

• W. Kiessling, 2006 - Compendium of calcimicrobes - (), - (unpublished, English)

• R. E. Plotnick, 2006 - Names of marine ichnofossil genera - (), - (unpublished, English)

• C. B. Skovsted, 2006 - Small shelly fauna from the upper Lower Cambrian Bastion and Ella Island Formations, North-East Greenland - Journal of Paleontology (80), 1087-1112 (journal article, English)

• J. Yao, 2005 - Basal Cambrian microfossils from the Yurtus and Xishanblaq Formations (Tarim, North-West China): Systematic revision and biostratigraphic correlaton of Micrhystridium-like acritarchs - Palaeontology (48), 687-708 (journal article, English)

• R. Wrona, 2004 - Cambrian microfossils from glacial erratics of King George Island, Antarctica - Acta Palaeontologica Polonica (49), 13-56 (journal article, English)

• W. Kiessling, 2004 - Ecology opinions - (), - (unpublished, )

• E. Mayoral, 2004 - Stranded jellyfish in the lowermost Cambrian (Corduban) of Spain - Revista española de paleontología (19), 191-198 (journal article, English)

• J. M. Malinky, 2004 - Hyoliths and small shelly fossils from the Lower Cambrian of NorthEast Greenland - Acta Palaeontologica Polonica (49), 551-578 (journal article, English)

• C. B. Skovsted, 2004 - The problematic fossil Triplicatella from the Early Cambrian of Greenland, Canada and Siberia - Canadian Journal of Earth Sciences (41), 1273-1283 (journal article, English)

• C. Skovsted, 2003 - Mobergellans (Problematica) from the Cambrian of Greenland, Siberia and Kazakhstan - Paläontologische Zeitschrift (77), 429-443 (journal article, English)

• J. B. Riding, 2002 - Aptian to Coniacian (Early–Late Cretaceous) palynostratigraphy of the Gustav Group, James Ross Basin, Antarctica - Cretaceous Research (), 739-760 (journal article, English)

• A. Williams, 2002 - Part H Brachiopoda (revised): Volume 4, Rhynchonelliformea (part) - Treatise on Invertebrate Paleontology (), 921-1688 (serial monograph, English)

• J. J. Alvaro, 2002 - Small shelly fossils from the Lower Cambrian Lastours Formation, southern Montagne Noir, France - Geobios (35), 397-409 (journal article, English)

• S. Xiao, 2002 - Macroscopic carbonaceous compressions in a terminal Proterozoic shale: a systematic reassessment of the Miaohe biota, south China - Journal of Paleontology (76), 347-376 (journal article, English)

• J. J. Sepkoski, Jr., 2002 - A compendium of fossil marine animal genera - Bulletins of American Paleontology (363), 1-560 (serial monograph, English)

• D. I. Gravestock, 2001 - The Cambrian biostratigraphy of the Stansbury Basin, South Australia - Russian Academy of Sciences, Transactions of the Palaeontological Institute (282), 1-344 (serial monograph, English)

• S. Bengtson, 2001 - The integument of Cambrian chancelloriids - Acta Palaeontologica Polonica (46), 1-22 (journal article, English)

• S. Schroeder, 2001 - Korallenfauna und Fazies givetischer Kalksteinabfolgen (Cuerten-/Dreimühlen-Formation) der Dollendorfer Mulde (Devon, Rheinisches Schiefergebirge/Eifel) - Senckenbergiana lethaea (81), 111-133 (journal article, English)

• A. Williams, 2000 - Part H Brachiopoda (revised): Volumes 2 & 3, Linguliformea, Craniiformea, Rhynchonelliformea (part). - Treatise on Invertebrate Paleontology (), 1-919 (serial monograph, English)

• Yu. E. Demidenko, 2000 - New Chancelloriid sclerites from the Lower Cambrian of South Australia - Paleontological Journal (34), 377-383 (journal article, )

• J. W. Hagadorn, 2000 - Ediacaran Fossils from the Southwestern Great Basin, United States - Journal of Paleontology (74), 349-359 (journal article, )

• J. G. Gehling, 2000 - The first named Ediacaran body fossil, Aspidella terranovica - Palaeontology (43), 427-456 (journal article, English)

• J. K. Bartley, 1998 - A Vendian–Cambrian boundary succession from the northwestern margin of the Siberian Platform: stratigraphy, palaeontology, chemostratigraphy and correlation - Geological Magazine (135), 473-494 (journal article, English)

• S. Conway Morris, 1997 - Lower Cambrian Cambroclaves (Incertae sedis) from Xinjiang, China, with comments on the morphological variability of sclerites - Palaeontology (40), 167-189 (journal article, )

• S. Conway Morris, 1997 - Mobergellans from the Lower Cambrian of Mongolia, Sweden, and the United States: molluscs or opercula of Incertae Sedis? - Journal of Paleontology (71), 968-985 (journal article, )

• B. Amard, 1997 - Chuaria pendjariensis n. sp., acritarche du bassin des Volta, Bénin et Burkina-Faso, Afrique de l’ouest: un taxon nouveau du Cambrien inférieur - Comptes Rendus de l'Académie des Sciences. Série 2. Sciences de la Terre et des Planètes (324), 477-483 (journal article, French)

• R. Trompette, 1996 - Temporal relationship between cratonization and glaciation: The Vendian-early Cambrian glaciation in Western Gondwana - Palaeogeography, Palaeoclimatology, Palaeoecology (123), 373-383 (journal article, English)

• E. Landing, 1996 - Oldest shelly fossils from the Taconic Allochthon and late Early Cambrian sea-levels in eastern Laurentia - Journal of Paleontology (70), 741-761 (journal article, )

• A. M. Duane, 1996 - Palynology of the Byers Group (Late Jurassic-Early Cretaceous) of Livingston and Snow islands, Antarctic Peninsula: its biostratigraphical and palaeoenvironmental significance - Review of Palaeobotany and Palynology (91), 241-281 (journal article, English)

• J. K. Rigby, 1995 - Lower Cambrian demosponges and hexactinellid sponges from Yunnan, China - Journal of Paleontology (69), 1009-1019 (journal article, English)

• O. Elicki, 1994 - Lower Cambrian carbonates from eastern Germany:palaeontology, stratigraphy and palaeogeography - Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen (191), 69-93 (journal article, )

• B. Wang, 1994 - New mollusks and problematic fossils from the Lower Cambrian of China - Paleontological Journal (28), 10-17 (journal article, )

• R. Riding, 1993 - Shamovella obscura: the correct name for Tubiphytes obscurus (Fossil) - Taxon (42), 71-73 (journal article, English)

• G. A. Brock, 1993 - Shelly fossils from the Early Cambrian (Toyonian) Wirrealpa, Arrona Creek, and Ramsay Limestones of South Australia - Journal of Paleontology (67), 758-787 (journal article, English)

• I. Puura, 1993 - Lingulate brachiopods from the Cambrian-Ordovician boundary beds in Sweden - Geologiska Föreningens i Stockholm Förhandlingar (115), 215-237 (journal article, English)

• P. J. D. Dolding, 1992 - Palynology of the Marambio Group (Upper Cretaceous) of northern Humps Island - Antartic Science (4), 311-326 (journal article, English)

• S. Bengtson, 1992 - Proterozoic and earliest Cambrian skeletal metazoans - The Proterozoic Biosphere: A Multidisciplinary Study (), 1017-1034 (book/book chapter, English)

• S. He, 1992 - The small shelly fossils from the Palaeocambrian Meishucunian stage in western Zhejiang - Geology of Zhejiang (8), 1-7 (journal article, Chinese)

• S. Conway Morris, 1992 - Carinachitiids, Hexangulaconnulariids and punctatus: problematic metazoans from the Early Cambrian of South China - Journal of Paleontology (66), 384-406 (journal article, )

• J. M. Keating, 1992 - Palynology of the Lachman Crags Member, Santa Marta Formation (Upper Cretaceous) of north-west James Ross Island - Antartic Science (4), 293-304 (journal article, English)

• E. Landing, 1991 - Uppermost Precambrian(?)-Lower Cambrian of mainland Nova Scotia: faunas, depositional environments, and stratigraphic revision - Journal of Paleontology (65), 382-396 (journal article, English)

• S. Bengtson, 1990 - Early Cambrian fossils from South Australia - Association of Australasian Palaeontologists (9), 1-364 (serial monograph, English)

• E. Landing, 1989 - The Placentian Series: Appearance of the oldest skeletalized faunas in southeastern Newfoundland - Journal of Paleontology (63), 739-769 (journal article, English)

• T. G. He, 1989 - Some problematic small shelly fossils from the Meishucunian of the Lower Cambrian in the western Yangtze region - Acta Micropalaeontologica Sinica (6), 111-127 (journal article, Chinese)

• Z. Yue, 1989 - A restudy of some Early Cambrian small shelly fossils from Ganluo and Emei, Sichuan, southwest China - Acta Micropalaeontologica Sinica (6), 389-407 (journal article, Chinese)

• V. V. Missarzhevsky, 1989 - Oldest skeletal fossils of late Precambrian and early Cambrian age: a review of recent work - Trudy Geologicheskogo Instituta AN SSSR (443), 1-231 (serial monograph, Russian)

• S. Conway Morris, 1988 - More soft-bodied animals and algae from the Middle Cambrian of Utah and British Columbia - University of Kansas Paleontological Contributions (122), 1-48 (journal article, English)

• A. H. Knoll, 1987 - Micropaleontology across the Precambrian-Cambrian boundary in Spitsbergen - Journal of Paleontology (61), 898-926 (journal article, English)

• P. W. Signor, 1987 - A pre-trilobite shelly fauna from the White-Inyou region of eastern California and western Nevada - Journal of Paleontology (61), 425-438 (journal article, )

• I. Hinz, 1987 - The Lower Cambrian microfauna of Comley and Rushton, Shropshire, England - Palaeontographica Abteilung A (198), 41-100 (serial monograph, English)

• N. I. Vasil’eva, 1986 - Novyj rod anabaritid iz nizhnego kembriya Sibirskoj platformy. [A new genus of anabaritids from the Lower Cambrian of the Siberian Platform] - Paleontological Journal (1986), 103-104 (journal article, English)

• H. Mostler, 1985 - Neue heteractinide Spongien (Calcispongea) aus dem Unter- und Mittelkambrium Südwestsardiniens [New heteractinid sponges (Calcispongia) from Lower and Middle Cambrian of SW Sardinia] - Berichte des Naturwissenschaftlich-Medizinischen Vereins Innsbruck (72), 7-32 (journal article, German)

• M. A. S. McMenamin, 1985 - Basal Cambrian small shelly fossils from the La Ciengega Formation, northwestern Sonora, Mexico - Journal of Paleontology (59), 1414-1425 (journal article, )

• N. I. Vassiljeva, 1985 - K sistematike otryada Chancelloriida Walcott, 1920 (On the systematics of the Chancelloriida Walcott,1920) - Problematiki pozdnego dokembriya i paleozoya (Late Precambrian and Palaeozoic Problematics). Trudy Institut geologii i geofiziki, Sibirskoe otdelenie, Akademiya nauk SSR (632), 115-126 (book/book chapter, Russian)

• X. Yang, 1984 - New small shelly fossils from Lower Cambrian Meishucun stage of Nanjiang area, northern Sichuan - Professional Papers of Stratigraphy and Palaeontology (13), 35-48 (journal article, Chinese)

• Y. Qian, 1984 - Small shelly fossils from the lowest Cambrian in Guizhou - Professional Papers of Stratigraphy and Palaeontology (13), 91-124 (journal article, Chinese)

• J. Qian, 1984 - An Early Cambrian small shelly fauna from Aksu-Wushi region, Xinjiang - Professional Papers of Stratigraphy and Palaeontology (13), 65-90 (journal article, Chinese)

• P. Chen, 1984 - Discovery of Lower Cambrian small shelly fossils from Jijiapo, Yichang, west Hubei and its significance - Professional Papers of Stratigraphy and Palaeontology (13), 49-64 (journal article, Chinese)

• O. V. Sosnovskaya, 1984 - Some problematic fossils from the Precambrian sequence of the Kuznets Alatau - Paleontological Journal (), 123-127 (journal article, )

• Y. Qian, 1984 - Zhijinitidae and its stratigraphical significance - Acta Palaeontologica Sinica (23), 215-223 (journal article, Chinese)

• C. Duan, 1984 - Small shelly fossils from the Lower Cambrian Xihaoping Formation the Shennongjia district, Hubei Province - hyoliths and fossil skeletons of unknown affinities - Bulletin of the Tianjin Institute of Geology and Mineral Resources (7), 141-188 (journal article, Chinese)

• T. He, 1984 - Some small shelly fossils from the Lower Cambrian Xinji Formation in Fangcheng County, Henan Province - Acta Palaeontologica Sinica (23), 350-357 (journal article, )

• Y. Qian, 1983 - Small shelly fossils from the Xihaoping Member of the Tongying Formation in Fangxian County of Hubei Province and their stratigraphical significance - Acta Palaeontologica Sinica (22), 82-94- (journal article, Chinese)

• R. J. Azmi, 1983 - Early Cambrian (Tommotian) conodonts and other shelly microfauna from the upper Krol of Mussoorie Syncline, Garhwal Lesser Himalaya with remarks on the Precambrian-Cambrian boundary - Himalayan Geology (11), 360-372 (journal article, English)

• A. K. Val'kov, 1982 - - Biostratigrafija nizhnego kembrija vostoka Sibirskoj platformy (), 1-92 (book/book chapter, Russian)

• M. Chen, 1981 - The small shelly fossil assemblage in the limestone of the uppermost part of the Dengying Formation at Songlingpo, Yichang - Journal of the Wuhan College of Geology, Earth Science (1), 32-41 (journal article, Chinese)

• V. V. Missarzhevsky, 1981 - Stratigrafiya i fauna pogranichnykh sloyev Kembriya i Dokembriya Malogo Karatau [Stratigraphy and fauna of the Precambrian-Cambrian boundary beds of the Malyy Karatau] - Trudy Ordena Trudovogo Krasnogo Znameni Geologicheskiy Institut Akademiya NAUK SSSR (326), 1-90 (serial monograph, Russian)

• W. Yü, 1979 - Earliest Cambrian monoplacophorans and gastropods from western Hubei with their biostratigraphical significance - Acta Palaeontologica Sinica (18), 233-270 (journal article, Chinese)

• D. V. Osadchaya, 1979 - Stratigrafiya i arkheotsiaty nizhnego kembriya Altaye-Sayanskoy skladchatoy oblasti [Lower Cambrian stratigraphy and archaeocyatha of the Altay-Sayan fold belt] - Trudy Instituta Geologii i Geofiziki, Sibirskoye Otdeleniye (380), 1-215 (serial monograph, Russian)

• Y. Qian, 1979 - Hyolithids and other small shelly fossils from the Lower Cambrian Huangshandong Formation in the eastern part of the Yangtze Gorge - Acta Palaeontologica Sinica (18), 207-230 (journal article, Chinese)

• A. M. Mambetov, 1979 - The Lower Cambrian of the Talassk Ala-Too and its correlation with the sections of Karatau Minor and the Siberian Platform - Rossiiskaya Akademiya Nauk Sibirskoe Otdelenie Trudy Instituta Geologii i Geofiziki (406), 98-138 (journal article, Russian)

• J. K. Rigby, 1978 - Porifera of the Middle Cambrian Wheeler Shale, from the Wheeler Amphitheater, House Range, in western Utah - Journal of Paleontology (52), 1325-1345 (journal article, English)

• Y. Qian, 1978 - The early Cambrian hyolithids in central and southwest China and their stratigraphical significance - Memoirs of Nanjing Institute of Geology and Palaeontology (11), 1-43 (journal article, Chinese)

• Y. Qian, 1977 - Hyolitha and some problematica from the Lower Cambrian Meishucun Stage in Central and SW China - Acta Palaeontologica Sinica (16), 255-278 (journal article, Chinese)

• B. Senowbari-Daryan, 1977 - Neue Kalkschwämme und ein Problematikum (Radiomura cautica n.g.,n.s.) aus Oberrhät-Riffen südlich von Salzburg (Nördliche Kalkalpen) - Mitteilungen der österreichischen geologischen Gesellschaft (), 17-42 (journal article, German)

• H. Mostler, 1976 - Neue Poriferen aus oberkambrischen Gesteinen der Mila-Formation im Elburzgebirge (Iran) [New Porifera from the Upper Cambrian Mila Formation in the Elburz Mountains (Iran)] - Geologisch-Paläontologische Mitteilungen Innsbruck (5), 1-36 (journal article, German)

• A. M. Blazer, 1975 - Index of Generic Names of Fossil Plants, 1966-1973 - Geological Survey Bulletin (), 1-54 (serial monograph, English)

• W. Hantzschel, 1975 - Miscellanea. Supplement 1. Trace Fossils and Problematica - Treatise on Invertebrate Paleontology (), W1-W269 (compendium, English)

• V. V. Missarzhevsky, 1974 - Novye dannye o drevnejshikh okamenelostyakh rannego kembriya Sibirskoj platformy - Biostratigraphiya i paleontologiya nizhnego kembriya Europy i severnoj Azii (), 179-189 (book/book chapter, English)

• O. G. Okuneva, 1973 - Biostratigrafiya i fauna kembriya Primorya [Cambrian biostratigraphy and fauna of Primorye] - Trudy Instituta Geologii i Geofiziki, Sibirskoye Otdelenye (37), 5-284 (serial monograph, Russian)

• A. K. Val'kov, 1970 - Angustiokreidy kembriya Sibiri [Cambrian angustiochreids of Siberia] - Stratigrafiya i paleontologiya proterozoya i kembriya vostoka Sibirskoj platformy (), 94-100 (book/book chapter, Russian)

• H. N. Andrews, 1970 - Index of Generic Names of Fossil Plants, 1820-1965 - Geological Survey Bulletin (), 1-354 (serial monograph, English)

• A. Y. Rozanov, 1969 - Tommotskiu jarus i problema nizhney granisty kembriya - Trudy Geoligske Institut Leningrad (206), 1-379 (serial monograph, Russian)

• L. G. Voronova, 1969 - Nakhodki vodoroslej i trubok chervej v pogranichnykh sloyakh kembriya i dokembriya na severe Sibirskoj platformy [Finds of algae and worm tubes in the Precambrian–Cambrian boundary beds of the northern part of the Siberian Platform] - Doklady AN SSSR (184), 207-210 (serial monograph, Russian)

• K. Sdzuy, 1969 - Unter- und mittelkambrische Porifera (Chancelloriida und Hexactinellida) - Palaeontologische Zeitschrift (43), 115-147 (journal article, German)

• A.Y. Rozanov, 1966 - Biostratigraphy and fauna of Lower Cambrian beds - Trudy Geoligske Institut Moscow (148), 1-126 (, )

• M. F. Glaessner, 1966 - The late Precambrian fossils from Ediacara, South Australia - Palaeontology (9), 599-628 (journal article, English)

• E. S. Richardson, 1966 - Wormlike fossils from the Pennsylvanian of Illinois - Science (151), 75-76 (journal article, English)

• D. W. Fisher, 1962 - Part W, Miscellanea: Small conoidal shells of uncertain affinities - Treatise on Invertebrate Paleontology (W), 98-143 (book/book chapter, English)

• V. A. Syssoiev, 1962 - Hiolity kembriâ severnogo sklona Aldanskogo šita - ANSSSR, Âkutskij filial’ Sibirskogo otdeleniâ, Âkutsk (), 1-65 (serial monograph, Russian)

• L. Ferguson, 1962 - The paleoecology of a Lower Carboniferous marine transgression - Journal of Paleontology (36), 1090-1107 (journal article, English)

• C. Lochman, 1956 - Stratigraphy, paleontology, and paleogeography of the Elliptocephala asaphoides strata in Cambridge and Hoosick quadrangles, New York - Geological Society of America Bulletin (67), 1331-1396 (journal article, English)

• B. F. Howell, 1946 - New name for homonym species of Cambrian Hyolithidae - Journal of Paleontology (20), 71-71 (journal article, English)

• P. E. Raymond, 1931 - Notes on invertebrate fossils, with descriptions of new species - Museum of Comparative Zoology, Harvard University (55), 165-213 (journal article, English)

• A. F. Foerste, 1924 - Upper Ordovician faunas of Ontario and Quebec - Geological Survey of Canada Memoir (138), 1-99 (serial monograph, )

• E.S. Cobbold, 1921 - The Cambrian horizons of Comley (Shropshire) and their Brachiopoda, Pteropoda, Gasteropoda and etc. - Quarterly Journal of the Geological Society of London (76), 325-386 (journal article, English)

• C. D. Walcott, 1911 - Middle Cambrian Holothurians and Medusae - Smithsonian Miscellaneous Collections (57), 41-68 (journal article, English)

• R. S. Bassler, 1911 - The early Paleozoic Bryozoa of the Baltic Provinces - Bulletin of the United States National Museum (77), 1-375 (journal article, English)

• C. D. Walcott, 1890 - Descriptive notes of new genera and species from the Lower Cambrian or Olenellus zone of North America - Proceedings of the United States National Museum (12), 33-46 (journal article, English)

• C. D. Walcott, 1890 - Description of new forms of Upper Cambrian fossils - Proceedings of the United States National Museum (13), 267-279 (journal article, English)

• J. Hall, 1879 - Containing descriptions of the Gasteropoda, Pteropoda, and Cephalopoda of the Upper Helderberg, Hamilton, Portage, and Chemung Groups - Natural History of New York, Paleontology (5), 1-492 (serial monograph, )

• H. A. Nicholson, 1872 - Ortonia, a New Genus of Fossil Tubicolar Annelides - Geological Magazine (9), 447-447 (journal article, )

• A. Stoppani, 1865 - Géologie et paléontologie des couches à Avicula contorta en Lombardie - Paleontologie Lombarde (3), 1-267 (journal article, French)