G. Nowlan

Publications102
h-index27
Citations1,783
Highly Influential Citations136
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Global Stratotype Section and Point for base of the Ordovician System
Ordovician System and base of the lowest Ordovician stage (Tremadocian) is exposed in the coastal platform at Green Point, western Newfoundland, at the 101.8 m level, within Bed 23, in the measured…
THE OLDEST HORSESHOE CRAB: A NEW XIPHOSURID FROM LATE ORDOVICIAN KONSERVAT‐LAGERSTÄTTEN DEPOSITS, MANITOBA, CANADA
Abstract:  A remarkable new fossil horseshoe crab, Lunataspis aurora gen. et sp. nov., from recently discovered Upper Ordovician (c. 445 Ma) shallow marine Konservat‐Lagerstätten deposits in Manitoba…
High-resolution 87Sr/86Sr chemostratigraphy of the Silurian: implications for event correlation and strontium flux
Analyses of 87Sr/86Sr in Silurian conodonts recovered from localities in North America and Europe representing 13 of the 14 defined Silurian conodont zones provide a high-resolution record of…
A microfauna associated with Early Cambrian trilobites of the Callavia Zone, norther Antigonish Highlands, Nova Scotia
Trilobites of the Callavia Zone s.1. occurring together with phosphatic fossils in the Little Hollow Formation are the first known Early Cambrian faunas from mainland Nova Scotia. The tectono-strat...
EARLY CAMBRIAN METAZOAN EGGS, EMBRYOS, AND PHOSPHATIC MICROFOSSILS FROM NORTHWESTERN CANADA
Abstract Three-dimensionally phosphatized, spherical fossils, interpreted as metazoan eggs and embryos on the basis of taphonomic features and cleavage patterns, are reported for the first time from…
Exceptionally preserved Late Ordovician biotas from Manitoba, Canada
There are few body fossil biotas known from early Paleozoic accretionary shorelines, and very few examples of Ordovician soft-bodied assemblages. This study documents two recently discovered biotas…
The conodont Iapetognathus and its value for defining the base of the Ordovician System
Nicoll et al. (1999, Brigham Young University Geology Studies 44, 27–101) published the taxonomy of species of the ramiform conodont Iapetognathus Landing in Fortey et al. (1982, The…
Conodonts from Ordovician-Silurian boundary strata, Whittaker Formation, Mackenzie Mountains, Northwest Territories
False teeth: conodont-vertebrate phylogenetic relationships revisited
TLDR
An evidence-based reassessment of the phylogenetic relationships of conodonts shows that they are not “stem” gnathostomes, nor vertebrates, and not even craniates, which supports neither a vertebrate nor a craniate relationship for conodons.
Iapetonudus (N. gen.) and Iapetognathus Landing, unusual Earliest Ordovician multielement conodont taxa and their utility for biostratigraphy
The Early Ordovician (Tremadocian) multielement conodont genus lapetognathus is one of the oldest denticulate euconodont genera known. The ramiform-ramiform apparatus structure of lapetognathus is…
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