1996/07/01 by Ed Landing, Stephen R. Westrop, Leanne A. Knox · 48 citations
Earth and Planetary Sciences · Engineering · #Biostratigraphy #Carbonate platform #Conodont #Geology #Hydrocarbon exploration and reservoir analysis #Laurentia #Marine Biology and Ecology Research #Onlap #Ordovician #Paleontology #Paleontology and Stratigraphy of Fossils #Sedimentary depositional environment #Sequence stratigraphy #Stratigraphy #Trace fossil #Trilobite
paper · doi:10.1017/s0022336000023623
published in Journal of Paleontology 70(4), 656-680 (Cambridge University Press)
openalex publication_date 1996/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/22
Tremadocian onlap is recorded by the Tribes Hill Formation. The formation is a lower Lower Ordovician (upper conodont Fauna B Interval(?)- Rossodus manitouensis Zone) depositional sequence that unconformably overlies the Upper Cambrian Little Falls Formation. Depositional environments and stratigraphy indicate that the Tribes Hill was deposited on a wave-, not tide-, dominated shelf and that a uniform, “layer-cake” stratigraphy is present. The deepening-shoaling sequence of the Tribes Hill includes the: 1) Sprakers Member (new; peritidal carbonate and overlying tempestite limestone and shale); 2) Van Wie Member (new; subtidal shale and limestone); 3) Wolf Hollow Member (revised; massive carbonates with thrombolitic cap); and 4) Canyon Road Member (new; glauconitic limestone and overlying evaporitic dolostone). The shoaling half-cycle of the Tribes Hill is older than a shoaling event in western Newfoundland, and suggests epeirogenic factors in earliest Ordovician sea-level change in east Laurentia. Conodont and trilobite biofacies track lithofacies, and Rossodus manitouensis Zone conodonts and Bellefontia Biofacies trilobites appear in the distal, middle Tribes Hill Formation. Twenty-four conodont species are illustrated. Ansella ? protoserrata new species, Iapetognathus sprakersi new species, Leukorhinion ambonodes new genus and species, and Laurentoscandodus new genus are described.