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select id,columnx from arkL_columns where dataset_id like 10

View/Edit arkL Database interval - M5a pfSZ

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The age-window currently being used to search for terms for autocompletion is -33.73 -> 66.39 Ma.

	interval above:	M5b pfSZ
parent-intervals:M5 pfZ;	this interval:	M5a pfSZ	sub-intervals:
	interval below:	M4b pfSZ

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Interval data

intervalx:	M5a pfSZhas added abv?yesid: 4336 sort:197
alternative_term:	block label:a
formal term:	Praeorbulina sicana Lowest-occurrence Subzone
interval_type:
parent_interval:
dataset:	forams - planktic (dataset id = 10)
alt dataset:	(dataset id = )
TSC Column:	id:108
stage:
colour:
interval_notes:	M5a" is Praeorbulina sicana Lowest-occurrence Subzone [was ’Praeorbulina sicana -Praeorbulina glomerosa s.str. Interval Subzone’] = (FAD of Praeorbulina sicana to FAD of Pr. glomerosa sensu stricto) (Berggren et al., 1995). This short subzone spans the lowermost part of the ’N8’ zone. The base of this zone is used to denote the base of the Langhian Substage (base of Middle Miocene), although this boundary may be more closely associated with the slightly younger FAD of Praeorbulina glomerosa s.str. (base of Subzone ’M5b’), which would render this substage about 0.3 myr shorter in duration.
compilation_notes:
refs to add:
linked refs:
preset_duration:
preset_duration_notes:
tracecode	; Q1base from event age; Q2top from event age; Q3a duration from base & top

	age2020	age		event	event_id	pup	in interval	age	age2020
Top:		16.2700	<---	FAD Praeorbulina glomerosa s.str.	6241	0.0000		16.27	00016.2700
Base:		16.3900	<---	FAD Praeorbulina sicana	6244	0.0000		16.39	00016.3900
base notes	Trilobatus sicanus = Mikrotax entry for this"Part of the evolutionary series from Trilobatus to Orbulina [editor’s comment - JRY 2018]"; but Praeorbulina sicana retained here as previous common usage on charts/zones. Age of 16.97 Ma was estimated from Atlantic ODP Sites 925 & 926; in Lourens et al. (2004) -- however this implied revised calibration to polarity chrons would seem to invert Medit. zones Mt4b and Mt5a of Berggren et al. (1995a). Berggren et al. (1995a) assign age as Chron C5Cn.2n (mid) and write: "LAD P. sicana occurs in interval of no paleomagnetic data about 20 m above FAD P. sicana which occurs in anom. 5C correlative in Hole 516 (Berggren et al., 1983)." Wade et al. (2011) write: ’Praeorbulina taxa are rare at Ceara Rise (Pearson and Chaisson, 1997) and therefore were not included in the revised calibration, and we have retained the ages reported in Berggren et al. (1995a) for FAD Orbulina suturalis (15.1 Ma), FAD Praeorbulina circularis, (16.0 Ma), FAD Praeorbulina curva (16.3 Ma) and Praeorbulina sicana (16.4 Ma)." We tentatively follow the Wade et al. (2011) assessment until further sites are investigated.				comp notes

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