Mazon Creek Shark Egg Case/Horseshoe Crab

[Roby]

I have only gone a couple times.  Still need to learn the area. There are places with giant sectarian concretions.  Try taking a couple softball sized home to freeze thaw and cross your fingers.  

[digit]

10 hours ago, Roby said:

There are places with giant sectarian concretions.

I think you mean "septarian" Whacking one of those with a hammer might otherwise be considered "sectarian violence".

 

https://en.wikipedia.org/wiki/Concretion#Septarian_concretions

 

I have a few septarians from Mazon Creek but as fractured as they are I don't think you'd find anything inside. I suspect they'd turn into a septarian puzzle if you applied the freeze-that method to them.

 

Here's one I have available to photograph. The concentric circular pattern of infilled seams caught my eye and so it came home with me.

     

 

Cheers.

 

-Ken

[Mark Kmiecik]

16 hours ago, Roby said:

There are places with giant sectarian concretions.

I doubt it. Septarian, yes. Sectarian, no. I've got one about the diameter of a basketball in the front yard. I'll get a photo of it as soon as the snow is gone.