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 456.9953 -> 559.55 Ma.

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

intervalx:	Maochuangian SNhas added abv?yesid: 15801 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:205
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:		506.9953	<---	base Hsuchuangian NChSt	16105	0.0000		506.9953	00507.0134
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