arkL edit interval

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select id,columnx from arkL_columns where dataset_id like 10

View/Edit arkL Database interval - M. schneegansi pfZ

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The age-window currently being used to search for terms for autocompletion is 39.7508 -> 142.5055 Ma.

	interval above:	D. concavata pfZ
parent-intervals:	this interval:	M. schneegansi pfZ	sub-intervals:
	interval below:	H. helvetica pfZ

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Interval data

intervalx:	M. schneegansi pfZhas added abv?yesid: 3505 sort:
alternative_term:	M. schneegansi zoneblock label:
formal term:	Marginotruncana schneegansi pfZ
interval_type:
parent_interval:
dataset:	forams - planktic (dataset id = 10)
alt dataset:	(dataset id = )
TSC Column:	id:104
stage:
colour:
interval_notes:	DOTTED -- "GAP" zone (LAD-base, FAD-top) is also called "D. primitiva-Mg. sigali Zone" (Coccioni-Silva’15 Gubbio column). Brian Huber, email of Jan2016) at 15% up in Middle Turonian: "LAD helvetica must be younger than 92.77 Ma since it is present at top of Pueblo GSSP section, using age determination by Huber, B. T., and Petrizzo, M. R., 2014 (Evolution and taxonomic study of the Cretaceous planktonic foraminifer Genus Helvetoglobotruncana Reiss, 1957 Journal of Foraminiferal Research, v. 44, p. 40-57). Should be dashed line.". Gale (Sept’18 chart) had drawn it again older, but probably didn’t know Brian Huber’s advice; so kept the GTS2016 version here. Gubbio (Coccioni-Silva’15) draws as exact middle of Turonian, which is essentially same as GTS2016. WAS (2012) -- For now, LAD of H. helvetica assigned as assigned as 80% up in M. nodosoides Zone to put coeval with FAD of nanno E. eximius. But that nanno FAD might be diachronous relative to LAD of H. helvetica (it is above LAD at Demerara Rise Leg 207; within Helvetica zone at Tanzania and S. Atl.). Pueblo (USA) => can get cycle-strat for both events (Dave Watkins; but he needs to check it). SEPM’98 assigned FAD at about 1 myr higher. Dual-markers (Eiffellithus eximius, Lucianorhabdus maleformis) for base of CC12; but separated in Burnett’98. SEPM’98 had assigned both FADs as middle of P. percarinatus Z. Base of P. percarinatus ammonite zone on SEPM’98 chart; which is about 0.6 myr younger. NOTE: Turonian Planktonic Foraminifer zone "M. schneegansi" of Robaszynski’s scale appears to be equivalent to "Marginotruncana sigali" foraminifer zone of Caron (1985), which is also begins with the LAD of H. helvetica. In both cases, the zone is a "gap zone" (LAD at base, FAD at top). However, the scheme of Caron (1985) has an overlying "Dicarinella primitiva" (base = FAD of D. primitiva), followed by Dicarinella concavata (base = FAD of D. concavata), with the base of D. primitiva approximately at base of Coniacian. The scheme of Robaszynski places the FAD of D. concavata within the upper Turonian, therefore the D. primitiva zone is eliminated.
compilation_notes:
refs to add:
linked refs:
preset_duration:
preset_duration_notes:
tracecode	; Q2top from event age; Q1base from event age; Q3a duration from base & top

	age2020	age		event	event_id	pup	in interval	age	age2020
Top:		89.7508	<---	FAD Dicarinella concavata	4360	0.9200	Turonian	89.7508	00089.7500
Base:		92.5055	<---	LAD Helvetoglobotruncana helvetica	4361	0.1500	Middle Turonian	92.5055	00092.5100
base notes	Helvetoglobotruncana helvetica:<br>Datum calibration/notes = DOTTED -- "GAP" zone (LAD-base, FAD-top) is also called "D. primitiva-Mg. sigali Zone" (Coccioni-Silva’15 Gubbio column). Brian Huber, email of Jan2016) at 15% up in Middle Turonian: "LAD helvetica must be younger than 92.77 Ma since it is present at top of Pueblo GSSP section, using age determination by Huber, B. T., and Petrizzo, M. R., 2014 (Evolution and taxonomic study of the Cretaceous planktonic foraminifer Genus Helvetoglobotruncana Reiss, 1957 Journal of Foraminiferal Research, v. 44, p. 40-57). Should be dashed line.". Gale (Sept’18 chart) had drawn it again older, but probably didn’t know Brian Huber’s advice; so kept the GTS2016 version here. Gubbio (Coccioni-Silva’15) draws as exact middle of Turonian, which is essentially same as GTS2016. WAS (2012) -- For now, LAD of H. helvetica assigned as assigned as 80% up in M. nodosoides Zone to put coeval with FAD of nanno E. eximius. But that nanno FAD might be diachronous relative to LAD of H. helvetica (it is above LAD at Demerara Rise Leg 207; within Helvetica zone at Tanzania and S. Atl.). Pueblo (USA) => can get cycle-strat for both events (Dave Watkins; but he needs to check it). SEPM’98 assigned FAD at about 1 myr higher. Dual-markers (Eiffellithus eximius, Lucianorhabdus maleformis) for base of CC12; but separated in Burnett’98. SEPM’98 had assigned both FADs as middle of P. percarinatus Z. Base of P. percarinatus ammonite zone on SEPM’98 chart; which is about 0.6 myr younger. NOTE: Turonian Planktonic Foraminifer zone "M. schneegansi" of Robaszynski’s scale appears to be equivalent to "Marginotruncana sigali" foraminifer zone of Caron (1985), which is also begins with the LAD of H. helvetica. In both cases, the zone is a "gap zone" (LAD at base, FAD at top). However, the scheme of Caron (1985) has an overlying "Dicarinella primitiva" (base = FAD of D. primitiva), followed by Dicarinella concavata (base = FAD of D. concavata), with the base of D. primitiva approximately at base of Coniacian. The scheme of Robaszynski places the FAD of D. concavata within the upper Turonian, therefore the D. primitiva zone is eliminated..				comp notes

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