Mined from: Coal City, Grundy County, Mason, Illinois, USA

Era: Late Paleozoic
Geological Age: 307 mya

Description: These well preserved fossil ferns also known as Pecopteris come from the Carbondale Formation, which is located in Coal City, Illinois. 
Pecopteris are an extinct family of seed ferns.  which simply means that they reproduce by dropping seeds rather than spores as with many modern ferns. These fossils are quite detailed and are preserved within siderite (iron carbonate) nodules. Their preservation is believed to have started with a catastrophic flood event. The deposition of river-borne silt and clay, brought on by upland erosion created the perfect conditions for their long lasting impressions. 

These fossilized fern impressions are captured within a clay nodule that act as their host rock or matrix. when closed they appear to be a lump of hardened clay, but once opened they revel a beautiful impression of an ancient seed fern. They make a wonderful addition to any fossil collection and can be displayed side by side to double your pleasure.

Small
Approximate Size of 1 Pair: (Closed)  4.5cm x 3.5cm x 2cm
Approximate Size of Each Piece: (Open Pair)  4.5cm x 3.5cm x 1cm
Approximate Weight of 1 Pair: 40g
Approximate Weight of Each Piece: 20g

Medium
Approximate Size of 1 Pair: (Closed) 6cm x 3cm x 2cm
Approximate Size of Each Piece: (Open Pair) 6cm x 3cm x 1cm
Approximate Weight of 1 Pair: 42g
Approximate Weight of Each Piece: 21g

Large
Approximate Size of 1 Pair: (Closed) 5.5cm x 3.5cm x 2cm
Approximate Size of Each Piece: (Open Pair) .5.cm x 3.5cm x 1cm
Approximate Weight of 1 Pair: 50g
Approximate Weight of Each Piece: 25g

XLarge
Approximate Size of 1 Pair: (Closed) 9.5cm x 9cm x 3cm
Approximate Size of Each Piece: (Open Pair) 9.5cm x 9cm x 1.5cm
Approximate Weight of 1 Pair: 300g
Approximate Weight of Each Piece: 150g

Quantity: 1pc

We do our best to buy quality products- although not every rock is the same. If you choose to purchase the "staff pick option", we will select the best of the batch for you. Otherwise, it will be at random from the larger batch we have in stock.