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Author Topic: Interesting stone  (Read 1469 times)

mark smyth

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Re: Interesting stone
« Reply #15 on: November 11, 2015, 10:32:36 PM »
please post larger photos
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Antrim, Northern Ireland Z8
www.snowdropinfo.com / www.marksgardenplants.com / www.saveourswifts.co.uk

When the swifts arrive empty the green house

All photos taken with a Canon 900T and 230

Maggi Young

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Re: Interesting stone
« Reply #16 on: November 12, 2015, 10:58:06 AM »
Quote from: mark smyth on November 11, 2015, 10:32:36 PM
please post larger photos

 The photos are very clear here just on opening - but they also enlarge well with scrolling, Mark.
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Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!

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Tristan_He

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Re: Interesting stone
« Reply #17 on: November 12, 2015, 08:49:51 PM »
Kind of appropriate that we are discussing crinoids since to my knowledge they are one of the few non-plant groups that possesses both a stalk and a calyx!

They are still around today of course, and the living organisms rival any flower in beauty

https://upload.wikimedia.org/wikipedia/commons/d/d2/Crinoid_on_the_reef_of_Batu_Moncho_Island.JPG

https://upload.wikimedia.org/wikipedia/commons/4/42/Colorful_crinoids_at_shallow_waters_of_Gili_Lawa_Laut.JPG

http://www.deepseanews.com/wp-content/uploads/2006/12/Neo-decorus-closeup.jpg
« Last Edit: November 13, 2015, 09:47:05 PM by Tristan_He »
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Maggi Young

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Re: Interesting stone
« Reply #18 on: November 12, 2015, 08:52:22 PM »
My word - what colours!  They can be  bright can't they?
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Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!

Editor: International Rock Gardener e-magazine

James Cheshire

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Re: Interesting stone
« Reply #19 on: November 14, 2015, 07:54:03 PM »
Quote
@ James - out of interest, how do you tell crinoid stem from blastoid?

There's no way to tell them apart from stems alone. Crinoids are much more abundant and widespread than blastoids in most rocks, so it's usually safe to assume that any stem remains belong to crinoids.
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James M. Cheshire - Granville, Ohio, USA - zone 6a.

Tristan_He

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Re: Interesting stone
« Reply #20 on: November 15, 2015, 02:43:50 PM »
OK thanks. Looking on Wikipedia it looks like blastoids died out at the end of the Permian, so I guess rock age could help?
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