Sand Dollar id please

[Ludwigia]

I'm interested in bidding for these sand dollars on our favorite website, but the seller can't tell me where they are from or what the statigraphy is. There are quite a few of them available on various websites, but they hardly give any more information about them. Most of them appear to be from Morocco, although I also saw similar ones from Florida. The given stratigraphy ranges from Cretaceous to Pleistocene and no one names even a genus, let alone a species. I sure would appreciate some details about them if anyone here in the forum has some in-depth information about them.

 

 

 

 

[DPS Ammonite]

The bottom one looks similar to what they are selling as Mexican Arrowhead Sand Dollar: Encope grandis?

 

You may have more than one species.

 

Also see this paper:

Phylogeography of the sand dollar genus Encope: implications regarding the Central American Isthmus and rates of molecular evolution. by Coppard

 

https://www.nature.com/articles/s41598-017-11875-w/figures/1

 

[Ludwigia]

2 hours ago, DPS Ammonite said:

The bottom one looks similar to what they are selling as Mexican Arrowhead Sand Dollar: Encope grandis?

 

You may have more than one species.

 

Also see this paper:

Phylogeography of the sand dollar genus Encope: implications regarding the Central American Isthmus and rates of molecular evolution. by Coppard

 

https://www.nature.com/articles/s41598-017-11875-w/figures/1

 

Thanks very much. Come to think of it, Mexico was also mentioned.

[Al Dente]

Here's a thread with some of these Mexican Sand dollars. About 20 or 30 years ago these were at every rock and fossil show and you could find them at rock shops everywhere. Now I never see them. http://www.thefossilforum.com/index.php?/topic/22525-mexican-sand-dollars/

[Ludwigia]

2 hours ago, Al Dente said:

Here's a thread with some of these Mexican Sand dollars. About 20 or 30 years ago these were at every rock and fossil show and you could find them at rock shops everywhere. Now I never see them. http://www.thefossilforum.com/index.php?/topic/22525-mexican-sand-dollars/

Thanks very much to you too. Now I think I've got all the info I need if I happen to make the highest bid.

[Coco]

On the top of the pic, I think they are Melitella stockesii. Mine are from Miocene/Pliocene New-Mexico and Miocene/Pliocene California.

 

About the 3rd one, OK with Encope grandis.

 

Coco

[siteseer]

14 hours ago, Al Dente said:

Here's a thread with some of these Mexican Sand dollars. About 20 or 30 years ago these were at every rock and fossil show and you could find them at rock shops everywhere. Now I never see them. http://www.thefossilforum.com/index.php?/topic/22525-mexican-sand-dollars/

 

Yes, I remember being in Tucson at the shows in the 90's.  A couple of guys would wander the shows with multiple flats of those on a dolly.  They were quick sellers and then the dealers would sell theirs pretty quickly as well.  They were coming from a stretch of beach in Baja California Sur near Muleje where they are common finds.  Someone told me they were Pleistocene in age.  I think Coco is right about the name.  Sometimes a Clypeaster-like echinoid is found there too.  I believe they stopped bringing them because the Mexican government started getting serious about any kind of fossil export about twenty years ago.  It used to be very lenient about things like sand dollars and shark teeth to keep tourists happy.

 

Jess

[Ludwigia]

7 hours ago, Coco said:

On the top of the pic, I think they are Melitella stockesii. Mine are from Miocene/Pliocene New-Mexico and Miocene/Pliocene California.

 

About the 3rd one, OK with Encope grandis.

 

Coco

Thanks, Coco