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Fossils From Gamebridge On Canada

Started by pleecan, Aug 24 2010 08:52 PM

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#41 pleecan

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Posted 17 September 2010 - 12:26 PM

We always can dream about finding trophy sized trilobites... some day it will happen.... on with the hunt....

Question: does anyone have data on size correlation of trilobites .... observation wise I am finding large trilobites in the ordovician, and smaller trilos but very sparse in the silurian and more plentiful but small in size in devonian eras....

#42 Northern Sharks

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Posted 17 September 2010 - 02:57 PM

View Postpleecan, on 17 September 2010 - 12:26 PM, said:

We always can dream about finding trophy sized trilobites... some day it will happen.... on with the hunt....

Question: does anyone have data on size correlation of trilobites .... observation wise I am finding large trilobites in the ordovician, and smaller trilos but very sparse in the silurian and more plentiful but small in size in devonian eras....

First, what do you consider small? With the exception of Isotelus, and a few others, most Ordovician trilobites are not large, under 5 cm. In Ontario, there are larger trilobites in the Silurian -Arctinurus boltoni at 10 cm/4" or so average and the largest trilobite in Ontario is Devonian -Terataspis grandis. While no complete specimens have been found, composites are up to 60 cm (2 feet) in length. There are also larger Phacops at Arkona, but being larger, they would get spotted and picked up that much sooner.

#43 JohnJ

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Posted 17 September 2010 - 04:19 PM

OK wait, Kevin...trilos are way out of my knowledge base...did you just say that some get up to 2 feet long? Whoaa!
The human mind has the ability to believe anything is true.

#44 Northern Sharks

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Posted 17 September 2010 - 04:55 PM

That's the largest from Ontario. The largest, Isotelus rex, from northern Manitoba measured 28" long and 16" wide. Adding to that already impressive size, the Isotelus doesn't have long spines on the pygidium to augment the length, as in Terataspis or Uralichas
http://www.trilobite...fo/lgtrilos.htm

#45 Auspex

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Posted 17 September 2010 - 05:06 PM

I-rex; putting the bite in trilobite!
"There has been an alarming increase in the number of things I know nothing about."
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#46 JohnJ

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Posted 17 September 2010 - 06:04 PM

Wow! That's just boogie board big!
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#47 pleecan

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Posted 18 September 2010 - 09:25 AM

Hi Kevin... you sure know your trilobites thanks for your input. I am still looking for that +12" trilobite ... Ontario is the place to dig.
Peter

#48 Ludwigia

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Posted 18 September 2010 - 07:54 PM

View Postpleecan, on 18 September 2010 - 09:25 AM, said:

Hi Kevin... you sure know your trilobites thanks for your input. I am still looking for that +12" trilobite ... Ontario is the place to dig.
Peter

I'm still happy with the 2" ones for the time being ;)

Roger.
Greetings from the Lake of Constance. Roger

#49 Ordovician_Odyssey

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Posted 08 January 2011 - 11:38 PM

View PostLudwigia, on 18 September 2010 - 07:54 PM, said:

I'm still happy with the 2" ones for the time being ;)

Roger.
same here roger ;)
my Triarthrus' are great!!
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#50 pleecan

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Posted 09 January 2011 - 12:05 AM

View Posttrilobite guy, on 08 January 2011 - 11:39 PM, said:

Can't Pseudogygitus get that big?

I was thinking Isotelus..... don't think pseudogytes get that big ... typical couple of inches.

#51 Northern Sharks

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Posted 09 January 2011 - 10:22 AM

I probably should have collected it, but didn't, but I have seen a Pseudogygites pygidium at Bowmanville (near the bottom) that was at least 3" wide. If complete, the whole critter would have been 5-6" long

#52 Ordovician_Odyssey

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Posted 09 January 2011 - 12:20 PM

View PostNorthern Sharks, on 09 January 2011 - 10:22 AM, said:

I probably should have collected it, but didn't, but I have seen a Pseudogygites pygidium at Bowmanville (near the bottom) that was at least 3" wide. If complete, the whole critter would have been 5-6" long
I've found some pygidiums 3" wide too... Those are definatly big ones
-Shamus
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#53 crinus

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Posted 23 January 2011 - 10:09 PM

Ok back to discussing Gamebridge fossil stuff.

I found this on my last trip to the quarry. I think it is a bryozoan but am not sure. It is encrusting a cephalopod (at least I think it is a cephalopod, as there are no details). Any idea anyone? Close up photo also provided.

Attached File  DSC_0464.JPG   255.37K   18 downloads Attached File  DSC_0463.JPG   373.36K   9 downloads

#54 pleecan

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Posted 23 January 2011 - 10:25 PM

View Postcrinus, on 23 January 2011 - 10:09 PM, said:

Ok back to discussing Gamebridge fossil stuff.

I found this on my last trip to the quarry. I think it is a bryozoan but am not sure. It is encrusting a cephalopod (at least I think it is a cephalopod, as there are no details). Any idea anyone? Close up photo also provided.

Attachment DSC_0464.JPG Attachment DSC_0463.JPG

Could it be an encrusted burrow?

#55 Northern Sharks

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Posted 23 January 2011 - 11:48 PM

By the brachs, I'm guessing the size of the encrusted piece is 2-2 1/2 inches??? I don't know what it is, but it's another thing to keep my eyes open for come the spring

#56 crinus

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Posted 14 March 2011 - 11:18 PM

View Postcrinus, on 23 January 2011 - 10:09 PM, said:

Ok back to discussing Gamebridge fossil stuff.

I found this on my last trip to the quarry. I think it is a bryozoan but am not sure. It is encrusting a cephalopod (at least I think it is a cephalopod, as there are no details). Any idea anyone? Close up photo also provided.

Attachment DSC_0464.JPG Attachment DSC_0463.JPG
It took a while but I finally got an ID on this specimen. It is a bryozoan. A cystoporate. The expert doing the ID is pretty sure that it is a Bythotrypa laxata. You can only be 100% sure by a thin section so I will go with the experts opinion. He is afer all an expert on Ordovician bryozoa.

rinus

#57 pleecan

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Posted 15 March 2011 - 07:54 AM

View Postcrinus, on 14 March 2011 - 11:18 PM, said:

It took a while but I finally got an ID on this specimen. It is a bryozoan. A cystoporate. The expert doing the ID is pretty sure that it is a Bythotrypa laxata. You can only be 100% sure by a thin section so I will go with the experts opinion. He is afer all an expert on Ordovician bryozoa.

rinus

Thanks for the update Crinus!
Presumed this is a fairly scares specimen.....
PL
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