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goniagnostus goniagnostus is a male


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Registration Date: 27.08.2007
Posts: 68

TOM for December Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

This month's trilobite is a remarkably spiny one!
I invite you to view it at: http://www.trilobites.info
But here it is as a preview!

Enjoy, Sam [goniagnostus]

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Sam [goniagnostus]
A Guide to the Orders of Trilobites
http://www.trilobites.info
01.12.2007 19:34 goniagnostus is offline Send an Email to goniagnostus Homepage of goniagnostus Search for Posts by goniagnostus Add goniagnostus to your Buddy List
juniper juniper is a male
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Registration Date: 26.01.2007
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That looks like a textbook specimen...
The remains with shell preservation are easily detected, with fantastic colour and surface, including even some (parts) of the spectacular pleural spines.
Is the rest preserved as an impression?
Or has the circulating halo of spines been reconstructed, to render an idea of the complete shape of this beautiful trilobite?


Die Schalenerhaltung ist wirklich sehenswert. Sind die übrigen Partien als Steinkern erhalten?
Oder wurde der umlaufende Strahlenkranz form-ergänzt, damit man die vollständige Gestalt des Trilobiten nachvollziehen kann?

best regards
Klaus

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2.Trilobiten-Tagung (19./20.2.2011): Abstracts der Vorträge
01.12.2007 22:04 juniper is offline Search for Posts by juniper Add juniper to your Buddy List
goniagnostus goniagnostus is a male


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Registration Date: 27.08.2007
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Thread Starter Thread Started by goniagnostus
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Zacanthoides grabaui typically preserves largely as an internal mold, so this specimen, as you note, has a remarkably large amount of exoskeleton still present. The pleural spines are left as molds that show the extent of the original spines, and the negative piece matches it, so there is no reconstruction. Dave Comfort is an extremely talented and careful preparator, and he was so struck by the axial preservation (usually that part of the shell is lost entirely) that he was wondering if this was indeed Z. grabaui and not some related new species. However, other specimens of Z. grabaui, though not showing the spine, do show a depression in the posterior thorax and pygidium that is clearly an impression of the axial spine, so we are now quite confident in the identification. It is a remarkable piece!

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Sam [goniagnostus]
A Guide to the Orders of Trilobites
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02.12.2007 03:34 goniagnostus is offline Send an Email to goniagnostus Homepage of goniagnostus Search for Posts by goniagnostus Add goniagnostus to your Buddy List
Schachtratte
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indeed. Nice bug

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02.12.2007 08:21 Schachtratte is offline Search for Posts by Schachtratte Add Schachtratte to your Buddy List
juniper juniper is a male
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Thank you, Sam, for your comment.
It shows again, how important it is to examine the negative part of the fossil, and to keep it in the collection, too.
I guess, even for a very experienced preparator it is sometimes amazing, which kind of miracles may appear when splitting a stone...

Klaus

PS.
Thank you for the translation "Steinkern" = internal mould :)
Yesterday I was unable to get that correct technical term...

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2.Trilobiten-Tagung (19./20.2.2011): Abstracts der Vorträge

This post has been edited 1 time(s), it was last edited by juniper: 02.12.2007 18:28.

02.12.2007 18:27 juniper is offline Search for Posts by juniper Add juniper to your Buddy List
Xiphogonium Xiphogonium is a male
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RE: TOM for December Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

quote:
Original von juniper
PS.
Thank you for the translation "Steinkern" = internal mould :)
Yesterday I was unable to get that correct technical term...


Indeed! :] "Unfortunately" the words mould and molt, which sound very similar and which are both being used frequently when referring to fossils, do seem to have a lot of fun in misleading and irritating non-native speakers of English! ;)

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Empfehle uns weiter! ;) (Klappern gehört zum Handwerk!)

02.12.2007 18:39 Xiphogonium is offline Send an Email to Xiphogonium Homepage of Xiphogonium Search for Posts by Xiphogonium Add Xiphogonium to your Buddy List YIM Account Name of Xiphogonium: xiphogonium
goniagnostus goniagnostus is a male


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Registration Date: 27.08.2007
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Thread Starter Thread Started by goniagnostus
RE: TOM for December Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

I am continually impressed by the ability of posters here to communicate in English. You do not want to see me try to write something in german! ; )
And I have learned that steinkern = internal mold (to use the US spelling of mould).

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Sam [goniagnostus]
A Guide to the Orders of Trilobites
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02.12.2007 20:11 goniagnostus is offline Send an Email to goniagnostus Homepage of goniagnostus Search for Posts by goniagnostus Add goniagnostus to your Buddy List
Xiphogonium Xiphogonium is a male
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Actually we don't have much choice! - Not only when it comes to fossil literature, etc. <g>

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02.12.2007 20:20 Xiphogonium is offline Send an Email to Xiphogonium Homepage of Xiphogonium Search for Posts by Xiphogonium Add Xiphogonium to your Buddy List YIM Account Name of Xiphogonium: xiphogonium
Andries Andries is a male
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8o unbelieveable
I´m really impressed by this one.
You really have to be lucky, to split the stone leaving the axial spines.
I´m still amazed.

can you tell the size of this trilobite?
02.12.2007 22:58 Andries is offline Send an Email to Andries Search for Posts by Andries Add Andries to your Buddy List
goniagnostus goniagnostus is a male


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I was told by Dave Comfort, who prepped the specimen, that it is 5 cm long, including the spines, which make up about the last 1 cm of length.

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Sam [goniagnostus]
A Guide to the Orders of Trilobites
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03.12.2007 01:37 goniagnostus is offline Send an Email to goniagnostus Homepage of goniagnostus Search for Posts by goniagnostus Add goniagnostus to your Buddy List
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