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Outputs (156)

The ICS international chronostratigraphic chart this decade (2025)
Journal Article
Cohen, K., Harper, D., Gibbard, P., & Car, N. (2025). The ICS international chronostratigraphic chart this decade. Episodes, 48(1), 105-115. https://doi.org/10.18814/epiiugs/2025/025001

The International Commission on Stratigraphy (ICS) has been producing and updating its International Chronostratigraphic Chart for several decades. The chart communicates higher-order divisions of geological time and actual knowledge on the numerical... Read More about The ICS international chronostratigraphic chart this decade.

New Ordovician bivalves from the Indochina Palaeoplate in Dali, western Yunnan, Southwest China and their palaeogeographic significance (2024)
Journal Article
Wang, Y., Fang, Z. J., Harper, D. A. T., Zhang, Y. C., Wei, X., Wang, G. X., & Zhan, R. B. (2025). New Ordovician bivalves from the Indochina Palaeoplate in Dali, western Yunnan, Southwest China and their palaeogeographic significance. Palaeoworld, 34(3), Article 100883. https://doi.org/10.1016/j.palwor.2024.09.007

A centre of radiation for Ordovician bivalves is identified based on an abundant and diverse fauna from the Hsiangyang Formation (Darriwilian, Middle Ordovician) of Dali, western Yunnan, Southwest China. It consists of 22 species of 18 genera includi... Read More about New Ordovician bivalves from the Indochina Palaeoplate in Dali, western Yunnan, Southwest China and their palaeogeographic significance.

The brachiopod faunas from the Fezouata Shale (Lower Ordovician; Tremadocian–Floian) of the Zagora area, Anti‐Atlas, Morocco: evidence for a biodiversity hub in Gondwana (2024)
Journal Article
Candela, Y., Harper, D. A. T., & Mergl, M. (2024). The brachiopod faunas from the Fezouata Shale (Lower Ordovician; Tremadocian–Floian) of the Zagora area, Anti‐Atlas, Morocco: evidence for a biodiversity hub in Gondwana. Papers in Palaeontology, 10(5), Article e1592. https://doi.org/10.1002/spp2.1592

Since the early 2000s, the discovery of fossils and their collection from the Fezouata Shale has accelerated; enabling us to understand the faunas more thoroughly. The brachiopod fauna has not been investigated for the past 50 years, and we present h... Read More about The brachiopod faunas from the Fezouata Shale (Lower Ordovician; Tremadocian–Floian) of the Zagora area, Anti‐Atlas, Morocco: evidence for a biodiversity hub in Gondwana.

Asymmetry In Thecidellina (Brachiopoda) From The Pliocene-Pleistocene Of Curaçao, Netherlands Antilles: Phenotypic Not Genotypic (2024)
Journal Article
Harper, D. A. T., La Turner, M., Donovan, S. K., & Portell, R. W. (2024). Asymmetry In Thecidellina (Brachiopoda) From The Pliocene-Pleistocene Of Curaçao, Netherlands Antilles: Phenotypic Not Genotypic. Rivista Italiana di Paleontologia e Stratigrafia, 130(3), 545-555. https://doi.org/10.54103/2039-4942/22870

Shape analysis of a large sample of the thecideid brachiopod Thecidellina from the Pliocene and Pleistocene rocks on the Caribbean island of Curaçao highlights asymmetry within the population. However, the 30 analysed specimens display a lack of a co... Read More about Asymmetry In Thecidellina (Brachiopoda) From The Pliocene-Pleistocene Of Curaçao, Netherlands Antilles: Phenotypic Not Genotypic.

Late Darriwilian (Middle Ordovician) conodonts from eastern and southeastern Ireland (2024)
Journal Article
Stouge, S., Harper, D. A. T., & Parkes, M. A. (2024). Late Darriwilian (Middle Ordovician) conodonts from eastern and southeastern Ireland. Irish Journal of Earth Sciences, 42(1), 15-60. https://doi.org/10.1353/ijes.2024.a935020

The Middle Ordovician (upper Darriwilian) marine deposits of the Bellewstown Limestone Member and Tramore Limestone Formation in eastern and southeastern Ireland, respectively, yield a diverse conodont assemblage of 21 taxa. The sedimentary rocks dep... Read More about Late Darriwilian (Middle Ordovician) conodonts from eastern and southeastern Ireland.

Insights into the morphology of Sphenothallus (Cnidaria): New features identified in an old genus, from the Carboniferous (Pennsylvanian, Bashkirian) of western Ireland (2024)
Journal Article
Doyle, E., Ahlberg, P., & Harper, D. A. T. (2024). Insights into the morphology of Sphenothallus (Cnidaria): New features identified in an old genus, from the Carboniferous (Pennsylvanian, Bashkirian) of western Ireland. Irish Journal of Earth Sciences, 42(1), 237-247. https://doi.org/10.1353/ijes.2024.a935031

The recent discovery of well-preserved fragments of Sphenothallus in the Central Clare Group (Pennsylvanian) of western Ireland provides new insights into the morphology of this enigmatic, putative cnidarian. The specimens demonstrate a morphological... Read More about Insights into the morphology of Sphenothallus (Cnidaria): New features identified in an old genus, from the Carboniferous (Pennsylvanian, Bashkirian) of western Ireland.

A new interpretation of Pikaia reveals the origins of the chordate body plan. (2024)
Journal Article
Mussini, G., Smith, M. P., Vinther, J., Rahman, I. A., Murdock, D. J. E., Harper, D. A. T., & Dunn, F. S. (2024). A new interpretation of Pikaia reveals the origins of the chordate body plan. Current Biology, 34(13), 2980-2989. https://doi.org/10.1016/j.cub.2024.05.026

Our understanding of the evolutionary origin of Chordata, one of the most disparate and ecologically significant animal phyla, is hindered by a lack of unambiguous stem-group relatives. Problematic Cambrian fossils that have been considered as candid... Read More about A new interpretation of Pikaia reveals the origins of the chordate body plan..

Paleontological Data Analysis (2024)
Book
Hammer, Ø., & Harper, D. A. T. (2024). Paleontological Data Analysis. (2nd ed.). Wiley

Paleontology has developed in recent decades into an increasingly data-driven discipline, which brings to bear a huge variety of statistical tools. Applying statistical methods to paleontological data requires a discipline-specific understanding of w... Read More about Paleontological Data Analysis.

An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia (2024)
Journal Article
Jin, J., & Harper, D. A. (2024). An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia. Journal of Paleontology, 98(1), 13-39. https://doi.org/10.1017/jpa.2023.87

Silicified brachiopods from Hirnantian strata in three sections of the lower Whittaker Formation, Mackenzie Mountains, northwestern Canada, yielded a moderately diverse, Edgewood-type Hirnantian fauna, consisting of 13 species: Biparetis paucirugosus... Read More about An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia.