Onset of the Ordovician cephalopod radiation – evidence from the Rochdale Formation (middle Early Ordovician, Stairsian) in eastern New York

Kröger, Björn; Landing, Ed

doi:10.1017/s0016756808004585

Cited by 18 publications

(49 citation statements)

References 28 publications

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“…Tarphycerids (Early Ordovician-late Silurian) with tightly coiled conchs are the oldest cephalopods with a supposedly nektonic mode of life resembling extant Nautilus (Kröger 2005, Kröger & Landing 2008. The time of hatching can be determined in fossil nautiloids by applying an actualistic approach using information from the early embryonic development of extant Nautilus (Stenzel 1964, Mutvei et al 1993, Mutvei & Doguzhaeva 1997).…”

Section: Hatching Indication In Tarphyceridsmentioning

confidence: 99%

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Turek¹,

Manda²

2016

Bull. Geosci.

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Our study of the early ontogeny of the Silurian Ophioceras has led to the revision of the current concept that many juvenile tarphycerids possessed a coiled conch upon hatching and thus resembled adults in habit as is in extant Nautilus. In fact, there is no evidence that any Early Palaeozoic coiled nautiloid possessed an embryonic conch exceeding half a whorl. A change in conch coiling, occasionally accentuated by a dorsolateral groove analogous to the nepionic constriction and the appearance of conspicuous growth anomalies indicate that, after hatching, Ophioceras possessed a cap-shaped, slightly curved conch, usually approximately a quarter whorl long. A hatchling thus differed substantially from the likely nektonic late juveniles with coiled conchs and their obliquely oriented aperture as in Nautilus. A relatively large first phragmocone chamber and very short body chamber possibly resulted in positive buoyancy and a planktonic habit of hatchlings. The embryonic conch size is highly variable and the height of the first chamber varies between 1.2-2.6 mm. Changes in sculpture across the embryonic/juvenile conch boundary are sometimes gradual, but frequently, hatching is manifested by an abrupt increase in growth line spacing and the appearance of longitudinal ridges. The cicatrix is here documented in the Tarphycerida for the first time. A distinct chamber length decrease, commonly present close to the end of the first whorl, is not linked with hatching. Anomalous conch structures in Ophioceras including healed injuries, atypical shapes of ribs, atypical courses of septa and pits occurring in late juvenile growth stages are described in the light of the autecology of Ophioceras and the determination of early post-embryonic growth anomalies. •

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Section: Hatching Indication In Tarphyceridsmentioning

confidence: 99%

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Turek¹,

Manda²

2016

Bull. Geosci.

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“…The Emanuel Limestone also contains taxa that suggest links with higher latitude cephalopod assemblages. Whilst Eothinoceras Ulrich et al, 1944 may be widely distributed across low latitude carbonate platforms during the late Tremadoc and early Floian; the genus having first been described from the Rochdale Limestone of New York (Ulrich et al 1944;Kraeger & Landing 2008), then from the Canning Basin (Teichert & Glenister 1954), North China (Chen & Teichert 1987) and Bolivia (Cecioni & Flower 1985;Evans 2007). Evans (2005,2007) suggested that Protocycloceras contrarium Teichert & Glenister from the Emanuel Limestone might in fact be a Saloceras given the well-developed ventral saddle and remarkably thick connecting rings.…”

Section: Paleogeographic Relationshipsmentioning

confidence: 99%

Review and palaeoecological analysis of the late Tremadocian - early Floian (Early Ordovician) cephalopod fauna of the Montagne Noire, France

Kröger¹,

Evans

2011

Fossil Record

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HS‐26, the mouse homologue of HS‐40, is the major regulatory element of the mouse α‐globin gene locus. Like HS‐40, HS‐26 is located within an intron of a house‐keeping gene; comparison of the nucleotide sequences of HS‐26 and HS‐40 reveals conservation of the sequences and positions of several DNA binding motifs in the 5′ regions of both elements (3 GATA, 2 NFE‐2, and 1 CACCC sites) and the absence in HS‐26 of three CACCC sites and one GATA site that are present in the 3′ region of HS‐40, suggesting that the two elements might not be identical. We report here that when HS‐26 is linked to a 1.5 kb Psti human α‐globin gene fragment, it has a weak enhancer activity in induced MEL cells and in transgenic embryos, and it does not have any detectable activity in adult transgenic mice. This suggests that HS‐26 does not have Locus Control Region (LCR) activity but can act as an enhancer during the embryonic life when integrated at a permissive locus. To further test the importance of HS‐26 at its natural locus, we have generated embryonic stem cells and chimeric animals in which 350 bp containing HS‐26 have been replaced by a neomycin resistance gene by homologous recombination. The sizes of the chimeras' red cells were then estimated by measuring forward scattering on a FacsScan apparatus in hypotonic conditions. This revealed that a fraction of the chimeric animals' red cells were smaller than normal mouse red cells and were very similar to cells from mice heterozygous for α‐thalassemia. Density gradient analysis also suggested the presence of thalassemic cells. These results indicated that despite its lack of LCR activity, HS‐26 is important for the regulation of the mouse α‐globin gene locus. Am. J. Hematol. 54:30–39, 1997 © 1997 Wiley‐Liss, Inc.

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“…Landing, 2007;Kröger & Landing, 2008;Landing et al 2010) (Fig. Landing, 2007;Kröger & Landing, 2008;Landing et al 2010) (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…1). Kröger & Landing (2008) recognized two informal divisions of the Rochdale, a 'lower member' and an upper 'thrombolitic member'. Kröger & Landing (2008) recognized two informal divisions of the Rochdale, a 'lower member' and an upper 'thrombolitic member'.…”

Section: Geological Settingmentioning

confidence: 99%

“…More recent study has been done on conodonts from the basal Rochdale and at an isolated outcrop of the unit in Washington County, eastern New York (Fig. This preliminary work and a restudy of cephalopods in Washington and Dutchess Counties (Kröger & Landing, 2008) showed the Rochdale to be early late Tremadocian (a generalized Stairsian age in Laurentia), but have not dealt with the regional stratigraphy and eustatic significance of the Rochdale. This preliminary work and a restudy of cephalopods in Washington and Dutchess Counties (Kröger & Landing, 2008) showed the Rochdale to be early late Tremadocian (a generalized Stairsian age in Laurentia), but have not dealt with the regional stratigraphy and eustatic significance of the Rochdale.…”

Section: Introductionmentioning

confidence: 99%

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Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont)

et al. 2011

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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 (12 000+ 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 d/a interval on the east Laurentian slope. The Rochdale has a lower carbonate with abundant quartz silt (Comstock Member, new) and an upper, thrombolitic (Hawk Member, new) highstand facies. Tribes Hill and Rochdale faunas are mollusc-rich, generally trilobite-poor, and have low diversity, Laurentian faunal province conodonts. Ulrichodina rutnika Landing n. sp. is rare in Rochdale conodont assemblages. Trilobites are also low in diversity, but locally form coquinas in the middle Tribes Hill. The poorly preserved Rochdale trilobites include the bathyurid Randaynia, at least two hystricurid species and Leiostegium.

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Onset of the Ordovician cephalopod radiation – evidence from the Rochdale Formation (middle Early Ordovician, Stairsian) in eastern New York

Cited by 18 publications

References 28 publications

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Review and palaeoecological analysis of the late Tremadocian - early Floian (Early Ordovician) cephalopod fauna of the Montagne Noire, France

Tribes Hill–Rochdale formations in east Laurentia: proxies for Early Ordovician (Tremadocian) eustasy on a tropical passive margin (New York and west Vermont)

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