arkL edit interval

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select id,columnx from arkL_columns where dataset_id like 10

View/Edit arkL Database interval - N15

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The age-window currently being used to search for terms for autocompletion is -40.11 -> 60.54 Ma.

	interval above:	N16
parent-intervals:	this interval:	N15	sub-intervals:
	interval below:	N14

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Interval data

intervalx:	N15has added abv?id: 4395 sort:0
alternative_term:	block label:
formal term:
interval_type:
parent_interval:
dataset:	forams - planktic (dataset id = 10)
alt dataset:	(dataset id = )
TSC Column:	id:117
stage:
colour:
interval_notes:
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:		9.8900	<---	FAD Neogloboquadrina acostaensis [subtropical]	6195	0.0000		9.89	00009.8900
Base:		10.5400	<---	LAD Paragloborotalia mayeri [subtropical]	6196	0.0000		10.54	00010.5400
base notes	DASHED -- Wade (in GTS2020): "Here we use the marker P. mayeri (following Berggren et al., 1995 and Wade et al., 2011) but continue to lump as P. siakensis/mayeri due to the ongoing taxonomic controversy (see Leckie et al. 2018 for discussion).", which she callibrates as 10.54 Ma (vs. 10.46 in GTS2016). [Called "Paragloborotalia siakensis" or "Neogloboquadrina mayeri" in some tables. -- Turco et al. (2002) explains: "The taxonomic concept of this species is rather controversial. According to Bolli and Saunders (1982, 1985), P. siakensis represents a junior synonym of P. mayeri. Other authors (e.g. Kennett and Srinivasan, 1983; Iaccarino, 1985; Foresi et al., 1998) following the species concept of Blow (1969) regarded P. siakensis and P. mayeri as distinct species, but have different opinion about the distribution range and the phylogeny of P.mayeri."] Astronomical age from Wade et al’11, who cited Lourens et al (GTS2004), in turn Chaisson and Pearson, 1997. This is about 1 myr "above" the projected chron-age of Berggren et al. (1995) -- In North Atlantic Sites 558, 563 and 608 LAD of ’N. mayeri’ was observed in close juxtaposition with FAD of ’N. acostaensis’, essentially eliminating Foraminifer Zone N15 (=M12). This has been varyingly interpreted as due to a hiatus in the North Atlantic (Aubry, 1993) or diachrony (ref. l,m). Therefore, Berggren et al’s assignment was C5r.2r; 11.4 Ma = C5r.2r.2. This LAD also defined their Base of Medit. zone Mt9. Wade et al’11 further clarify: "The extinction of Paragloborotalia mayeri has been recalibrated to 10.53 Ma as per Chaisson and Pearson (1997) (given as siakensis in Turco et al., 2002). This is significantly younger (870 kyr) than the previous reported age of 11.40 Ma in BKSA95. The interpolated age would place this event mid-C5n.2n rather than C5r.2r. The age used in BKSA95 is calibrated to the magnetostratigraphy at Site 563 (Miller et al., 1985) and this discrepancy may be due to diachrony between the tropical and subtropical Atlantic Ocean. Hilgen et al. (2000) noted the diachrony in the extinction of P. mayeri between the tropical Atlantic Ocean and the Mediterranean and diachrony with higher latitudes was suggested by Miller et al. (1991)." The older "Top P. mayeri" event in cycle-tuned temperate Mediterranean (12.07 Ma in Lourens et al., 2004) is here used as a separate regional event. Age updated as per Zeeden et al. (2013).				comp notes

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