Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont)
Abstract Slow subsidence and tectonic quiescence along the New York Promontory margin of Laurentia mean that the carbonate-dominated Tribes Hill and overlying Rochdale formations serve as proxies for the magnitude and timing of Tremadocian eustatic changes. Both formations are unconformity-bound, de...
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Online Access: | http://dx.doi.org/10.1017/s0016756811000598 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756811000598 |
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crcambridgeupr:10.1017/s0016756811000598 2024-05-12T08:07:18+00:00 Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont) LANDING, ED ADRAIN, JONATHAN M. WESTROP, STEPHEN R. KRÖGER, BJÖRN 2011 http://dx.doi.org/10.1017/s0016756811000598 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756811000598 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 149, issue 1, page 93-123 ISSN 0016-7568 1469-5081 Geology journal-article 2011 crcambridgeupr https://doi.org/10.1017/s0016756811000598 2024-04-18T06:54:29Z Abstract Slow subsidence and tectonic quiescence along the New York Promontory margin of Laurentia mean that the carbonate-dominated Tribes Hill and overlying Rochdale formations serve as proxies for the magnitude and timing of Tremadocian eustatic changes. Both formations are unconformity-bound, deepening–shoaling, depositional sequences that double in thickness from the craton into the parautochthonous, western Appalachian Mountains. A consistent, ‘layer cake’ succession of member-level units of the formations persists through this region. The Tribes Hill Formation (late early Tremadocian, late Skullrockian, late Fauna B– Rossodus manitouensis Chron) unconformably overlies the terminal Cambrian Little Falls Formation as the lowest Ordovician unit on the New York Promontory. It was deposited during the strong early Tremadocian, or Stonehenge, transgression that inundated Laurentia, brought dysoxic/anoxic (d/a) slope water onto the shelf and led to deposition of the Schaghticoke d/a interval (black mudstone and ‘ribbon limestone’) on the Laurentian continental slope. The uniform lithofacies succession of the Tribes Hill includes a lower sand-rich member; a middle, dark grey to black mudstone that records d/a in eastern exposures; and an upper, shoaling-up carbonate highstand facies. A widespread (12000+ km 2 ) thrombolitic interval in the highstand carbonate suggests the New York Promontory was rimmed by thrombolites during deposition of the Tribes Hill. Offlap and erosion of the Tribes Hill was followed by the relatively feeble sea-level rise of the Rochdale transgression (new) in Laurentia, and deposition of the Rochdale Formation. The Rochdale transgression, correlated with the Kierograptus Drowning Interval in Baltica, marks a eustatic rise. The Rochdale Formation represents a short Early Ordovician interval (early late Tremadocian, middle–late Stairsian, Macerodus dianae Chron). It correlates with a depositional sequence that forms the middle Boat Harbour Formation in west Newfoundland and with the Rte 299 ... Article in Journal/Newspaper Newfoundland Cambridge University Press Boat Harbour ENVELOPE(69.433,69.433,-49.633,-49.633) Geological Magazine 149 1 93 123 |
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Geology LANDING, ED ADRAIN, JONATHAN M. WESTROP, STEPHEN R. KRÖGER, BJÖRN Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont) |
topic_facet |
Geology |
description |
Abstract Slow subsidence and tectonic quiescence along the New York Promontory margin of Laurentia mean that the carbonate-dominated Tribes Hill and overlying Rochdale formations serve as proxies for the magnitude and timing of Tremadocian eustatic changes. Both formations are unconformity-bound, deepening–shoaling, depositional sequences that double in thickness from the craton into the parautochthonous, western Appalachian Mountains. A consistent, ‘layer cake’ succession of member-level units of the formations persists through this region. The Tribes Hill Formation (late early Tremadocian, late Skullrockian, late Fauna B– Rossodus manitouensis Chron) unconformably overlies the terminal Cambrian Little Falls Formation as the lowest Ordovician unit on the New York Promontory. It was deposited during the strong early Tremadocian, or Stonehenge, transgression that inundated Laurentia, brought dysoxic/anoxic (d/a) slope water onto the shelf and led to deposition of the Schaghticoke d/a interval (black mudstone and ‘ribbon limestone’) on the Laurentian continental slope. The uniform lithofacies succession of the Tribes Hill includes a lower sand-rich member; a middle, dark grey to black mudstone that records d/a in eastern exposures; and an upper, shoaling-up carbonate highstand facies. A widespread (12000+ km 2 ) thrombolitic interval in the highstand carbonate suggests the New York Promontory was rimmed by thrombolites during deposition of the Tribes Hill. Offlap and erosion of the Tribes Hill was followed by the relatively feeble sea-level rise of the Rochdale transgression (new) in Laurentia, and deposition of the Rochdale Formation. The Rochdale transgression, correlated with the Kierograptus Drowning Interval in Baltica, marks a eustatic rise. The Rochdale Formation represents a short Early Ordovician interval (early late Tremadocian, middle–late Stairsian, Macerodus dianae Chron). It correlates with a depositional sequence that forms the middle Boat Harbour Formation in west Newfoundland and with the Rte 299 ... |
format |
Article in Journal/Newspaper |
author |
LANDING, ED ADRAIN, JONATHAN M. WESTROP, STEPHEN R. KRÖGER, BJÖRN |
author_facet |
LANDING, ED ADRAIN, JONATHAN M. WESTROP, STEPHEN R. KRÖGER, BJÖRN |
author_sort |
LANDING, ED |
title |
Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont) |
title_short |
Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont) |
title_full |
Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont) |
title_fullStr |
Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont) |
title_full_unstemmed |
Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont) |
title_sort |
tribes hill–rochdale formations in east laurentia: proxies for early ordovician (tremadocian) eustasy on a tropical passive margin (new york and west vermont) |
publisher |
Cambridge University Press (CUP) |
publishDate |
2011 |
url |
http://dx.doi.org/10.1017/s0016756811000598 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756811000598 |
long_lat |
ENVELOPE(69.433,69.433,-49.633,-49.633) |
geographic |
Boat Harbour |
geographic_facet |
Boat Harbour |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Geological Magazine volume 149, issue 1, page 93-123 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756811000598 |
container_title |
Geological Magazine |
container_volume |
149 |
container_issue |
1 |
container_start_page |
93 |
op_container_end_page |
123 |
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1798849920496566272 |