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select id,columnx from arkL_columns where dataset_id like 3

View/Edit arkL Database interval - Douvilleiceras mammillatum BAZ

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The age-window currently being used to search for terms for autocompletion is 60.22 -> 160.868 Ma.

	interval above:	Lyelliceras lyelli BAZ
parent-intervals:	this interval:	Douvilleiceras mammillatum BAZ	sub-intervals: Pseudosonneratia steinmanni BAsZ; Otohoplites bulliensis BAsZ; Protohoplites puzosianus BAsZ; Otohoplites raulinianus BAsZ; Cleoniceras floridum BAsZ; Sonneratia kitchini BAsZ; Sonneratia perinflata BAsZ;
	interval below:	Leymeriella tardefurcata BAZ

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Interval data

intervalx:	Douvilleiceras mammillatum BAZhas added abv?yesid: 2930 sort:307
alternative_term:	D. mammillatum BAZblock label:
formal term:
interval_type:
parent_interval:
dataset:	ammonites Sub-Boreal (dataset id = 3)
alt dataset:	(dataset id = )
TSC Column:	id:9
stage:
colour:
interval_notes:
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:		110.2200	<---	base Lyelliceras lyelli BAZ	3194	0.0000	Middle Albian	110.22	00110.2200
Base:		110.8680	<---	base Douvilleiceras mammillatum BAZ	3201	0.0000	Douvilleiceras mammillatum TAZ	110.868	00110.8680
base notes	= Base of mammillatum/perinflata: There is a problem; summarized in Reboulet et al. (2011; Kilian Group report) -- has problems of correlation to Tethys. But, assumed here to be coeval, and subzones assigned equal durations. OLDER GTS: Hardenbol et al. (1998) placed the FAD of foraminifer T. primula at the exact middle of the mammillatum zone (which contains 7 subzones). Therefore, using this logic, then the cycle-scaled age of 110.9 Ma for this level implies a total of 11.5 ammonite subzones in 4.8 myr, or 0.42 myr per subzone. If this scaling was extended to the base of the mammillatum zone (3.5 subzones lower, hence 1.46 myr older than 110.9 Ma), then the projected age is112.36 Ma. This would fit the dashed-estimate equivalence of the FAD of P. columnata with the base of the mammillatum zone by Hardenbol et al., 1998 (and other schemes shown in comparison chart of Mutterlose et al., 2003, such as Bown et al., 1998), but is inconsistent with the approximate coincidence of P. columnata with the base of the Albian (base of schrammeni zone) in Germany (Mutterlose et al., 2003). Therefore, to avoid this inconsistency, I decided to scale ALL the ammonite zones between base of inflatum (106.1 Ma) and base of tardefurcata/schrammeni (112.0 Ma) according to their component ammonite subzones. Total of 19 subzones in 5.6 myr = 0.295 myr each. Base of mammillatum (7 subzones at 0.295 = 2.0 myr) = 110.8 Ma. GTS2004 note: ""Albian ammonite zonal scheme of J. Thierry et al. in Jan Hardenbol’s chart has a ’perinflata’ subzone, which is not always in other zonal schemes. The above ’S. kitchini’ s.z. encompasses this earlier interval in Amedro’s zonation.				comp notes

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