Ammonoid biostratigraphy of the Middle Triassic Latemar platform (Dolomites, Italy) and its correlation with Nevada and Canada

Manfrin, Stefano; Mietto, Paolo; Preto, Nereo

doi:10.1016/j.geobios.2004.01.005

Cited by 29 publications

(48 citation statements)

References 11 publications

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“…The faunas from ammonoid layers were described as storm deposits. These were transported and comprise mixed faunal elements (pelagic ammonoids and benthic gas- tropods; Manfrin et al 2005). This is almost identical to the assemblages found at Aşağiyaylabel.…”

Section: Oxygenated Shallow-water Habitatssupporting

confidence: 55%

“…They were therefore interpreted as being redeposited from shallower areas down to a shelf margin or mid-ramp position ). In contrast to Assereto (1969), additional findings of celtitids were presented by Manfrin et al (2005) from adjacent basinal series surrounding the Latermar platform. The faunas from ammonoid layers were described as storm deposits.…”

Section: Oxygenated Shallow-water Habitatsmentioning

confidence: 63%

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Ammonoid Habitats and Life History

Lukeneder

2015

Topics in Geobiology

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Section: Oxygenated Shallow-water Habitatssupporting

confidence: 55%

Section: Oxygenated Shallow-water Habitatsmentioning

confidence: 63%

Ammonoid Habitats and Life History

Lukeneder

2015

Topics in Geobiology

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“…Ammonoids are common in the lagoonal interior successions of Latemar and Marmolada (e.g., Tommasi 1895;Brack and Rieber 1993;De Zanche et al 1995;Zühlke et al 2003;Manfrin et al 2005), and are known also from coeval carbonate platforms of the Adige Valley (Manfrin and Mietto 1991). At Latemar, ammonoids occur mostly in tepee cavities, which acted as sedimentary traps for ammonoid-bearing storm deposits (Manfrin et al 2005).…”

Section: Geological Settingmentioning

confidence: 99%

“…At Latemar, ammonoids occur mostly in tepee cavities, which acted as sedimentary traps for ammonoid-bearing storm deposits (Manfrin et al 2005). The abundance of ammonoids allows a precise biostratigraphic datation of these buildups.…”

Section: Geological Settingmentioning

confidence: 99%

“…The abundance of ammonoids allows a precise biostratigraphic datation of these buildups. The Latemar is thus known to span the avisianum, crassus and secedensis (ex serpianensis) subzones of the biochronostratigraphic scheme of Mietto and Manfrin (1995), while the studied portion of the Marmolada platform belongs exclusively to the secedensis subzone (De Zanche et al 1995;Manfrin et al 2005) (Fig. 3).…”

Section: Geological Settingmentioning

confidence: 99%

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Dasycladalean algae distribution in ammonoid-bearing Middle Triassic platforms (Dolomites, Italy)

Piros¹,

Preto

2008

Facies

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This paper gives an account of distribution of Dasycladales in ammonoid-bearing Middle Triassic carbonate platforms of the Dolomites. A ca. 600-m-thick section was investigated within the Latemar platform interior and Dasycladales from correlated ammonoidbearing samples of the Marmolada platform were studied for comparison. At Latemar, the dense sampling allowed, with some confidence, the identification of the first occurrences of Diplopora nodosa and Gyroporella ladinica, and the last occurrences of D. annulatissima and D. comelicana. Their stratigraphic range was found to be in agreement with literature. Other first or last occurrences could not be reconciled with known distributions, and were considered as environmentally or palaeogeographically controlled. All four algal events occur within a narrow interval of two Illyrian (Upper Anisian) ammonoid subzones (avisianum and crassus subzones). This study demonstrates the biostratigraphic potential of Dasycladales in platform settings, and highlights the necessity of detailed stratigraphic studies to determine their distribution

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The Allocyclic Interpretation of the ‘Latemar Cycles’ (Middle Triassic, the Dolomites, Italy) and Implications for High‐Frequency Cyclostratigraphic Forcing

Forkner

Hinnov

Goldhammer

et al. 2009

Perspectives in Carbonate Geology

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The Middle Triassic Latemar Platform is an approximately 5 km wide, 700 m thick isolated carbonate platform succession containing over 500 cycles (<1 m average thickness), which have been attributed to allocyclic forcing by Milankovitch to subMilankovitch cycle driven composite eustasy. These interpretations are based on the facies composition of the cycles (thicker subtidal units overlain abruptly by thin, centimetre-scale, subaerial caps), the 5:1 bundling of the 'fundamental' metre-scale cycles into lower-frequency 'megacycles', and spectral analyses of thickness and rank series showing conspicuous matches to predicted Milankovitch periodicities. The infl uence of periodic Milankovitch cycle-driven composite eustasy on the development of the Latemar cyclic succession has been questioned based on the dating of ashfall tuffs, palaeomagnetic analysis of the platform, and correlation to biostratigraphic markers in nearby basinal deposits. In order to test the interpretation of allocyclic forcing for Latemar cycles, the cyclic succession preserved at Mendola Pass (located 30 km northwest of Latemar Platform) was investigated where Latemar-equivalent cyclic platform interior strata are well exposed. The Mendola cycles (average 0.70 m per cycle) are also bundled into upward-thinning packages with an approximate 5:1 ratio. However, unlike the subtidal deposits immediately overlain by vadose diagenetic caps found in the Latemar succession, Mendola cycles consist of a mud-rich subtidal unit gradationally overlain by a cryptomicrobial (peritidal) laminite cap. A measured section from Mendola Pass of 36 cycles correlates biostratigraphically and statistically to a unique interval within the Latemar succession. Although laminite-capped cycles are often attributed to autocyclicity, the similarity of the stacking patterns of the Mendola cycles to those of Latemar support an allocyclic interpretation. In addition, depositional rates calculated from dated Holocene shallow-water carbonate facies equivalent to those at Latemar and Mendola Pass are shown to be consistent with Milankovitch or multimillennial periodicities, rather than millennial (1 kyr) cycle periods. Finally, the question of whether comparative sedimentology can be relied upon for the interpretation of relative cycle duration is considered, or if comparative sedimentology has reached its useful limit for identifying facies and depositional environments with respect to the Middle Triassic. It is concluded that statistical and biostratigraphic correlations, in addition to comparative sedimentology, indicate that the Latemar and Mendola cycles were deposited under the control of an allogenic forcing mechanism, and that this mechanism generated depositional cycles with multimillennial individual periodicities.

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Ammonoid biostratigraphy of the Middle Triassic Latemar platform (Dolomites, Italy) and its correlation with Nevada and Canada

Cited by 29 publications

References 11 publications

Ammonoid Habitats and Life History

Ammonoid Habitats and Life History

Dasycladalean algae distribution in ammonoid-bearing Middle Triassic platforms (Dolomites, Italy)

The Allocyclic Interpretation of the ‘Latemar Cycles’ (Middle Triassic, the Dolomites, Italy) and Implications for High‐Frequency Cyclostratigraphic Forcing

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