arkL edit interval

select id,columnx from arkL_columns where dataset_id like 137

The age-window currently being used to search for terms for autocompletion is 452.0025 -> 559.55 Ma.

	interval above:	Upper Cambrian NChSer
parent-intervals:	this interval:	Middle Cambrian NChSer	sub-intervals: Changhian SN; Hsuchuangian SN; Maochuangian SN;
	interval below:	Lower Cambrian NChSer

intervalx:	Middle Cambrian NChSerhas added abv?yesid: 15795 sort:43
alternative_term:	block label:
formal term:
interval_type:
parent_interval:
dataset:	stages North China (Camb) (dataset id = 137)
alt dataset:	(dataset id = )
TSC Column:	id:203
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:		502.0025	<---	base Kushanian NChSt	16107	0.0000		502.0025	00502.0250
Base:		509.5500	<---	base Maochuangian NChSt	16104	0.9000	Duyunian SChSt	509.55	00509.5500
base notes	DASHED -- Base is about 90% up in Duyunian stage of S. China. Peng (2003): 'In North China, the base of the Maochuangian is usually taken as the Lower-Middle Cambrian boundary. It is defined by either the extinction of Redlichia or by the first appearance of ptychopariid trilobites. Such a dual standard makes it difficult to determine the boundary or the base of the Maochuangian in some sections in South China, where Redlichia and ptychopariids are found in association.'				comp notes

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Peng, S. C. (2003). Chronostratigraphic subdivision of the Cambrian of China. Geologica Acta. 1(1): 135-144. gs