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My husband and I just found a whole bunch of these in a gravel creek bed in Beggs Oklahoma. I am pretty sure they are from the Pennsylvanian period. they are round, like a ball. they looked pretty out of place to us. We also found a bunch that were halved.

I've been interested in comparing the various locations where Pennsylvanian siderite fossils are found. So I've decided to collect the information I have so far into this topic. This is based on bits of information that I could find and may need corrected. Feel free to add images of your fossils from any of these locations. And If you have other locations to add, please do. I'll add those into this first post. Nodules at these locations are all similar to those found at the well-known location of Mazon Creek in Illinois. Nearly all locations are in the gray shale directly above the coal so they each occur at the same point in each of their cyclothems--as the coal forest is being inundated with the rising ocean levels. Each cyclothem is the result of regular glacial and interglacial periods lasting about 100,000 or so years. cyclothem that I'm working on.... Approximate ages are very rough, based on the number of cyclothems between each formation. Here's a graphic of a Here's the list from oldest to youngest formations with some images and references. ___________________________________________ Mansfield formation?? Aprox. age: 315-320 mya Indiana ___________________________________________ Photos from linked paper on Crockhey UK--Crockhey Opencast Aprox. age: 315 mya??? (Westphalian A) overlying: Wigan Coal Paper on Crockhey Fossils http://steurh.home.xs4all.nl/engcrock/ecrock.html ___________________________________________ Stanley Cemetery Flora / Brazil Formation Aprox. age: 313 mya overlying: Lower Block Coal/ Tartar Location: Green and Vigo County, Indiana Brazil Formation of Indiana Stanley Cemetery Flora of Greene County ___________________________________________ Mazon Creek / Francis Creek Shale Aprox. age: 309 mya overlying: Colchester Coal Location: Grundy County, Illinois ___________________________________________ Photo from Collection of Missourian Knob Noster, Missouri Aprox. age: 309 mya overlying: Croweburg Coal Location: Knob Noster, MO ___________________________________________ Okmulgee, Oklahoma Aprox. age: 309 mya overlying: Henryetta Coal Location: Okmulgee, OK The Okmulgee, Oklahoma fossil flora, a Mazon Creek equivalent ___________________________________________ Energy Shale Aprox age: 306.5 mya overlying: Herrin Coal Carterville and Georgetown, Illinois A middle Pennsylvanian fern from Carterville, Illinois Herrin Quadrangle Map with Notes about Energy Shale ___________________________________________ Chieftain No. 20 Flora / Dugger Formation Aprox. age: 305.5 mya overlying: Danville Coal / Coal VII Vigo County, Indiana Chieftain No. 20 Flora (Middle Pennsylvanian) of Vigo County, Indiana