New Occurrences of<i>Oldhamia</i>in Eastern Yukon, Canada: Stratigraphic Context and Implications for Cambrian Deep-Marine Biostratigraphy

MacNaughton, R B; Moynihan, David P.; Roots, C F; Crowley, James L.

doi:10.1080/10420940.2015.1127232

Cited by 19 publications

(9 citation statements)

References 31 publications

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“…Cambrian deep‐marine ichnofaunas are markedly different from younger counterparts, and tend to be restricted to straight, curved to loosely meandering, nonspecialized grazing trails (e.g., Helminthopsis , Helminthoidichnites ) showing close association with microbial mats (Buatois & Mángano, 2003; MacNaughton et al, 2016; Orr, 2001). In addition to these nonspecialized grazing trails, arthropod trackways (e.g., Diplichnites ), and more sophisticated feeding strategies ( Oldhamia ) are also common, the latter being also typically associated with matgrounds (Buatois & Mángano, 2003; Mángano & Buatois,2003; MacNaughton et al, 2016; Mángano & Buatois, 2017; Seilacher et al, 2005). Commonly, the evolutionary innovations of the Cambrian explosion in combination with microbial matground ecosystems resulted in the development of various interactions, such as the appearance of sophisticated feeding strategies (e.g., Oldhamia in Cambrian deep‐marine environments) (Buatois & Mángano, 2003).…”

Section: Discussionmentioning

confidence: 99%

The interplay of environmental constraints and bioturbation on matground development along the marine depositional profile during the Ordovician Radiation

et al. 2021

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This study documents the distribution of matgrounds in a wide variety of environments recorded in the Ordovician Lashkerak and Ghelli Formations in the Alborz Mountains of northern Iran in order to evaluate controls on their distribution along the marine depositional profile. Detailed facies analysis allowed differentiating three groups of facies associations in the Lower to Upper Ordovician deposits of the Lashkerak formation: (i) estuarine system; (ii) wave‐dominated shoreface‐offshore complex; and (iii) mixed river‐ and wave‐influenced deltaic system. The Middle to Upper Ordovician deposits of the Ghelli formation are divided into two groups of facies associations: (i) tide‐influenced deltaic succession and (ii) deep‐water fan system. Microbially induced sedimentary structures (MISS) are present in deposits formed in the central estuarine basin (Lashkerak formation) and in proximal lobes and lobe fringes of deep–water turbidite fans (Ghelli formation). On the contrary, MISS are absent in deposits from the wave‐dominated shoreface‐offshore complex, river‐ and tide‐dominated deltas, and various subenvironments of the incised wave‐dominated estuary (i.e., bayhead delta and estuary mouth) and the deep‐marine turbidite fan system (i.e., turbidite channel, slope, and outer lobe). The lack of evidence of mat‐building microorganisms in the deltaic systems may have resulted from two factors: (1) high physico‐chemical stressors caused by river‐induced processes, and (2) increase in degree of sediment disturbance, biodiffusion, and bioirrigation by burrowing organisms. Formation of microbial mats in the wave‐dominated shoreface‐offshore complex was inhibited by the activity of an abundant and diverse infauna capable of reworking the sediment. Our analysis shows that the spatial distribution of microbial mats was controlled by an interplay of environmental factors and innovations in animal‐substrate interactions, mostly expressed by secular changes in bioturbation. This study supports the notion that the agronomic revolution was diachronic, with marginal‐marine and deep‐sea ecosystems lagging behind shallow‐marine settings.

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Section: Discussionmentioning

confidence: 99%

The interplay of environmental constraints and bioturbation on matground development along the marine depositional profile during the Ordovician Radiation

et al. 2021

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“…Two gallon-sized bags of sandstone were collected at each site (Dakota Sandstone, Cox 2, 3, and 4) and processed accordingly to the techniques set forth by the Central Analytical Facility at Stellenbosch University including crushing, milling, panning, Frantz magnetic separation, and density liquid separation. Thereafter, analysis of the recovered zircon grains was undertaken via standard methods of Boise State University’s Isotope Geology Laboratory (Boise, Idaho, USA) as noted in several other studies ( Bold, 2016 ; MacNaughton et al, 2016 ; Normore et al, 2018 ; Tucker et al, 2020 ).…”

Section: Methodsmentioning

confidence: 99%

Age constraint for the Moreno Hill Formation (Zuni Basin) by CA-TIMS and LA-ICP-MS detrital zircon geochronology

Cilliers

Tucker

Crowley

et al. 2021

PeerJ

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The “mid-Cretaceous” (~125–80 Ma) was punctuated by major plate-tectonic upheavals resulting in widespread volcanism, mountain-building, eustatic sea-level changes, and climatic shifts that together had a profound impact on terrestrial biotic assemblages. Paleontological evidence suggests terrestrial ecosystems underwent a major restructuring during this interval, yet the pace and pattern are poorly constrained. Current impediments to piecing together the geologic and biological history of the “mid-Cretaceous” include a relative paucity of terrestrial outcrop stemming from this time interval, coupled with a historical understudy of fragmentary strata. In the Western Interior of North America, sedimentary strata of the Turonian–Santonian stages are emerging as key sources of data for refining the timing of ecosystem transformation during the transition from the late-Early to early-Late Cretaceous. In particular, the Moreno Hill Formation (Zuni Basin, New Mexico) is especially important for detailing the timing of the rise of iconic Late Cretaceous vertebrate faunas. This study presents the first systematic geochronological framework for key strata within the Moreno Hill Formation. Based on the double-dating of (U-Pb) detrital zircons, via CA-TIMS and LA-ICP-MS, we interpret two distinct depositional phases of the Moreno Hill Formation (initial deposition after 90.9 Ma (middle Turonian) and subsequent deposition after 88.6 Ma (early Coniacian)), younger than previously postulated based on correlations with marine biostratigraphy. Sediment and the co-occurring youthful subset of zircons are sourced from the southwestern Cordilleran Arc and Mogollon Highlands, which fed into the landward portion of the Gallup Delta (the Moreno Hill Formation) via northeasterly flowing channel complexes. This work greatly strengthens linkages to other early Late Cretaceous strata across the Western Interior.

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“…13 Dusel-Bacon et al (1995). is Early Cambrian to early-Middle Cambrian in age (Hofmann et al, 1994;MacNaughton et al, 2016). The Oldhamia-bearing rocks in the northwestern Circle quadrangle were correlated by Weber et al (1992) with the Wickersham grit unit mapped in the Livengood quadrangle to the west, whereas the two occurrences of Oldhamia north of the northern strand of the Tintina fault are included in the Crazy Mountains terrane of Churkin et al (1982) (Fig.…”

Section: Geologic Settingmentioning

confidence: 98%

Detrital zircon geochronology of quartzose metasedimentary rocks from parautochthonous North America, east-central Alaska

et al. 2017

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We report eight new U-Pb detrital zircon ages for quartzose metasedimentary rocks from four lithotectonic units of parautochthonous North America in east-central Alaska: the Healy schist, Keevy Peak Formation, and Sheep Creek Member of the Totatlanika Schist in the northern Alaska Range, and the Butte assemblage in the northwestern Yukon-Tanana Upland. Excepting 1 of 3 samples from the Healy schist, all have dominant detrital zircon populations of 1.9-1.8 Ga and a subordinate population of 2.7-2.6 Ga. Three zircons from Totatlanika Schist yield the youngest age of ca. 780 Ma. The anomalous Healy schist sample has abundant 1.6-0.9 Ga detrital zircon, as well as populations at 2.0-1.8 Ga and 2.7-2.5 Ga that overlap the ages from the rest of our samples; it has a minimum age population of ca. 1007 Ma. Detrital zircon age populations from all but the anomalous sample are statistically similar to those from (1) other peri-Laurentian units in east-central Alaska; (2) the Snowcap assemblage in Yukon, basement of the allochthonous Yukon-Tanana terrane; (3) Neoproterozoic to Ordovician Laurentian passive margin strata in southern British Columbia, Canada; and (4) Proterozoic Laurentian Sequence C strata of northwestern Canada. Recycling of zircon from the Paleoproterozoic Great Bear magmatic zone in the Wopmay orogen and its Archean precursors could explain both the Precambrian zircon populations and arc trace element signatures of our samples. Zircon from the anomalous Healy schist sample resembles that in Nation River Formation and Adams Argillite in eastern Alaska, suggesting recycling of detritus in those units.

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New Occurrences ofOldhamiain Eastern Yukon, Canada: Stratigraphic Context and Implications for Cambrian Deep-Marine Biostratigraphy

Cited by 19 publications

References 31 publications

The interplay of environmental constraints and bioturbation on matground development along the marine depositional profile during the Ordovician Radiation

The interplay of environmental constraints and bioturbation on matground development along the marine depositional profile during the Ordovician Radiation

Age constraint for the Moreno Hill Formation (Zuni Basin) by CA-TIMS and LA-ICP-MS detrital zircon geochronology

Detrital zircon geochronology of quartzose metasedimentary rocks from parautochthonous North America, east-central Alaska

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