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anonimus

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  • »anonimus« ist der Autor dieses Themas

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Donnerstag, 3. September 2015, 11:33

Agnostida erratic to ID

Once more legendary historic erratic quarry Mokrzeszów know as Nider-Kunzendorf. This time some Agnostida



Jens

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Donnerstag, 3. September 2015, 12:11

Hi,

seems to be Agnostus pisiformis from the Upper Cambrian (Furongian). Quite common in some of these stinkstones and widely distributed in Sweden, Bornholm and parts of the Baltic Sea.

all the best and nice finds there.

Jens
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Michael

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Donnerstag, 3. September 2015, 13:49

Hi Anonimus,

I agree with Jens, it should be Agnostus pisiformis, but it´s now not longer Furongian (Upper Cambrian). I think Agnostus pisiformis is now uppermost Middle Cambrian... Nice find with nice colours, thanks for showing !

Best wishes,
Micha

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Montag, 7. September 2015, 13:02

Yes, the times - and the ICS chart - they keep achangin'! :201:

Mike
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Montag, 7. September 2015, 13:11

Hi Micha,

indeed, I forgot that change, it's now Guzhangian which made as much sense as the famous sack of rice falling down in China. Anyway, it's a decision and such borders are man made, so if the Upper Cambrian starts a bit earlier or later is not that important ;-) The funny thing is, there are Olenus species in the Agnostus pisiformis Zone and the stinkstone is highly bituminous like the others of the Furongian in Baltoscandian. But the stinkstones below that do not stink inthe same way and contains less bitumen. It was always a good indicator in the field to distinguish even small pieces of rock ;-)

Here a PDF for people who like to read somewhat more about these stages we speak about: http://www.geol.umd.edu/~hcui/Reference/…19-Cambrian.pdf

all the best,
Jens
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