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Heteromorph

A few weeks ago my mother, Stella (dog), and I went to a old-reliable heteromorph site in the Atco. After I dragged all my equipment to the part of the site that I was going to work, she went walking with Stella to look at some of the check-dams full of brought in Edwards limestone, chicken wire bags full of the brought in matrix put in the ditches for sediment control. In 2017 while we were at the same Atco site she was looking at a dumped pile of the Edwards and found a rare cidarid (see thread here) that compares well with Temnocidaris (Stereocidaris) hudspethensis. The sight of seeing that bizarre looking fossil just laying on the ground was quite a shock for both of us and motivation to hunt the dams more, and since then she has been casually looking over every check-dam hoping for another one. But because this Atco site is also rich in heteromorphs, I tend to focus all my attention on the chalk and neglect the Edwards dams, in these cases to my slight ire but also amazement at what she found with Stella.

 

She did it again on the 9th, and found another cidarid that appears to be the same species as the last one from 2017, though from a different dam. I was at my Atco pile when she came over and showed it to me, completely blowing away all my finds in a very welcome way. 

 

The brought in Edwards is early upper Albian in age (about 107.6 mybp) and is a very fossiliferous crystalline limestone jammed packed with rudists and Chondrodonta sp. as well as the occasional gastropod. It makes for quite the sensory overload when trying to look for other things amongst the fossiliferous morass. The limestone is also interspersed with somewhat softer red sandstone that infills crevices in the much harder limestone and is more quickly weathered away in older exposures. I have tried so-far unsuccessfully to isolate the quarry from which the matrix originated to ask them permission to get a chance at the fossils before they are dumped in bags and hauled tens of miles to sites, damaging them. The problem is that there are multiple quarries in the nearest counties that expose the Edwards, namely Hood and Johnson counties. I have seen this matrix at sites all over North Texas, but I don't know if all that matrix is from the same quarry as the matrix from my Atco site since the Edwards is heavily quarried for fill all over the state. For now we are left to dig though the jumbled, knocked around bagged matrix, but even so the limestone is extremely hard so the fossils are not usually completely destroyed. And the site is big with lots of busted open bags. 

 

This latest cidarid is in about the same condition as the first, that being not so great but not so bad. Both specimens are missing most of their adoral sides and their apical plates are gone, leaving their circular apical scars. But they are still quite nice and intricately detailed, and also preserve some of their big mamelon tubercles, with the first specimen preserving 2 and the latest preserving 5, though there could be more under the globs of matrix stuck to them. This latest is also bigger. The first had a diameter of 52 mm at the ambitus and a preserved height of 37 mm, while the latest is 59 mm at the ambitus and 45 mm in height, though keep in mind that since they are both missing most of their adoral sides they would have had more height in life. The apical scar on the first specimen is 19 mm in diameter and on the second is 21 mm, with the crushed calcite fragments of the apical plates seen in the cavities left behind on both. 

 

I really didn't expect her to find another specimen of this rarity again, but apparently this matrix is a honey hole brought in by the truck load, making this site two honey holes in two epochs. Then on Wednesday I went by the same check dam from which this latest cidarid came and found what really appears to be a belemnite, but that is for another topic in the ID forum. Hopefully I can post that find soon.

 

Since new Atco exposure at the site has temporarily slowed down I have an excuse to take a good hard look at the Edwards dams tomorrow afternoon. If we find anymore from the dams I will post it to this thread, so hope to see more :fingerscrossed: 

 

In the mean time, here are the pictures of the echinoids, the check dam from which this latest specimen came, and a nifty Chondrodonta sp. she found in said dam. I welcome any other finds that anyone has found in the Edwards or its equivalents and any tips on how to prep limestone as hard as crystalized concrete. Also, sorry for the picture quality. My Nikon decided to die a few months ago for some reason and I have yet to get it fixed, so if anyone knows a camera repair shop that fixes Nikons in the DFW area, I am all ears.

 

*Pictures incoming, computer acting up*

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JohnJ

Sounds awesome....

 

:popcorn::popcorn::popcorn:

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Heteromorph

5ca02b7b660ef_ScreenShot2019-03-30at9_50_49PM.png.f9e17eec5df438f386b10a158b5643fa.png

Figs. 1-2. Check dam from which this last cidarid originated.

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Heteromorph

5ca02c991ce03_ScreenShot2019-03-30at9_56_09PM.png.94d41b819fe5b456d42bda4ae8aefc78.png

Fig. 2.

 

fullsizeoutput_5342.thumb.jpeg.c956dfee951f5a56974ce03811097f5e.jpeg

Figs. 3-5. 2017 cidarid on left, new cidarid on right.

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Heteromorph

fullsizeoutput_5341.thumb.jpeg.fd3c224bf173957dfc59d56638a0b51c.jpeg

Fig. 4.

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Heteromorph

fullsizeoutput_5346.thumb.jpeg.5be0443d033d06c638861babfed8126c.jpeg

Fig. 5.

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Heteromorph

fullsizeoutput_5347.thumb.jpeg.e096cfc90f9e21d7419d4f877b5e4fe5.jpeg

Figs. 6-11. New cidarid.

 

fullsizeoutput_5348.thumb.jpeg.e9b8d2da4c603a2cb478c571b0f2d2e9.jpeg

Fig. 7.

 

fullsizeoutput_534c.thumb.jpeg.585dd3dfc7ae87bede674b15690fdce0.jpeg

Fig. 8.

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Heteromorph

fullsizeoutput_534e.thumb.jpeg.c13809102ab0279075909e0ebb6d75b7.jpeg

Fig. 9.

 

fullsizeoutput_534f.thumb.jpeg.c7cdcdcd45763d691c689797cf75ee18.jpeg

Fig. 10.

 

fullsizeoutput_5350.thumb.jpeg.489af27e10ec6556e64ff7f4fa3c74c5.jpeg

Fig. 11.

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Heteromorph

fullsizeoutput_5340.thumb.jpeg.e13c2d74fbb2289df511e27f14bee352.jpeg

Fig. 12. Chondrodonta sp

 

Done. See, I am doing better. 12 instead of 60.

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JohnJ

Absolutely amazing finds given the context of the discoveries.  In the Edwards Formation, they are uncommon finds as separate elements and incredibly rare as finds like these.  Congratulations.

:SlapHands:

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Tidgy's Dad

Marvelous, congratulations.

And rather beautiful too. :)

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DPS Ammonite

Nice finds. It sounds like your Mom needs her own TFF account.

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Nimravis

Great finds- Congrats 

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Jackson g

Glad your able to rescue some of those fossils. They are some very nice specimens! Good luck hunting more down.

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Monica

Beautiful echinoids! :wub:

 

Congrats to you and your mom, too! :)

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deutscheben

What excellent finds! Thank you for sharing.

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Uncle Siphuncle

I've seen one of these come from the Ked quarry in Blum, Arnold Crushed Stone, which also produces Ophiura brittlestars.  I've been in there once or twice years ago on DPS trips.  The Ked is sure slow to weather.  Maybe worth another look at this point, if you care to make inroads.

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Heteromorph
12 hours ago, JohnJ said:

Absolutely amazing finds given the context of the discoveries.  In the Edwards Formation, they are uncommon finds as separate elements and incredibly rare as finds like these.  Congratulations.

:SlapHands:

Thanks! Hopefully there will be even more to come. Either we are crazy lucky of the rock is crazy productive. Maybe both.

12 hours ago, Tidgy's Dad said:

Marvelous, congratulations.

And rather beautiful too. :)

Thank you! Quite nice for decoration indeed.

11 hours ago, DPS Ammonite said:

Nice finds. It sounds like your Mom needs her own TFF account.

Thanks! Maybe someday, but for now she just prefers Facebook. 

11 hours ago, Nimravis said:

Great finds- Congrats 

Thanks! 

5 hours ago, Jackson g said:

Glad your able to rescue some of those fossils. They are some very nice specimens! Good luck hunting more down.

Thanks! Hope to soon.

3 hours ago, Monica said:

Beautiful echinoids! :wub:

 

Congrats to you and your mom, too! :)

Thanks!

1 hour ago, deutscheben said:

What excellent finds! Thank you for sharing.

Thanks!

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Heteromorph
55 minutes ago, Uncle Siphuncle said:

I've seen one of these come from the Ked quarry in Blum, Arnold Crushed Stone, which also produces Ophiura brittlestars.  I've been in there once or twice years ago on DPS trips.  The Ked is sure slow to weather.  Maybe worth another look at this point, if you care to make inroads.

Thanks for the information! Perhaps that is what I have been looking for. Are you aware of any belemnites having been found there? 

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Uncle Siphuncle
5 hours ago, Heteromorph said:

Thanks for the information! Perhaps that is what I have been looking for. Are you aware of any belemnites having been found there? 

Negatory. 

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Darktooth

Great finds! Congratulations!

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FossilDAWG

:wub: :wub: :wub: :envy:

Don

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goatinformationist

As amazing as the finds are I am gobsmacked that you and your mom owned what looks like very rough terrain.  Brava.

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ynot

Sweet finds!

Congratulations to the finder.

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dalmayshun

gorgeous pieces. Congrats

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