arkL edit interval

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select id,columnx from arkL_columns where dataset_id like 26

View/Edit arkL Database interval - Nangaoan SChSt

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The age-window currently being used to search for terms for autocompletion is 464.5 -> 571 Ma.

	interval above:	Duyunian SChSt
parent-intervals:Qiandongian SChSer;	this interval:	Nangaoan SChSt	sub-intervals:
	interval below:	Meishucunian SChSt

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Interval data

intervalx:	Nangaoan SChSthas added abv?yesid: 15770 sort:52
alternative_term:	block label:
formal term:
interval_type:
parent_interval:
dataset:	stages South China (Jur -> Camb) (dataset id = 26)
alt dataset:	(dataset id = )
TSC Column:	id:167
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:		514.5000	<---	base Duyunian SChSt	16080	0.0000	Oryctocarella duyunensis TrZ	514.5	00514.5000
Base:		521.0000	<---	base Nangaoan SChSt	16079	0.0000	Tsunyidiscus niutitangensis TrZ	521	00521.0000
base notes	Base of Trilobites (base of Tsunyidiscus niutitangensis Zone). Peng (2003): 'the first appearance of trilobites represents an important step in biotic development. For this reason, the FAD of trilobites is chosen to define the lower boundary of the Nangaoan Stage of SouthChina (named by Peng, 2000), even though obtaining a reliable lowest occurrence of trilobites in South China, and correlating such a level to other regions prove difficult. The Xiaosai section near Xiaosai, Yuqing, eastern Guizhou Province, is chosen as the type section of the lower boundary of the stage . In the section, the eodiscoid trilobite Tsunyidiscus sp. first appears. Eodiscoids (Tsunyidiscus, Neocobboldia, Sinodiscus, Hupeidiscus), in association with protolenids (Paraichangia), characterize the lower part of the stage in the type section. As defined, the base of the stage seems to correspond to that of the traditional Chiungchussuan Stage				comp notes

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