Stromatolites?

[Girquir]

Hi guys,

When I look online, I see mostly photos of fossil with solid cross sections, with all of the banding, or else the living stromatolite examples in Australia. However there was one publication through the University of Wisconsin extension by Neme and Bemis (2002) that has a rendering of a stromatolite that looks similar to this one which I found at Mazon in the South Unit:

Do you think this is one?

Next, I found these two specimen in the same gully on Easter Day, in Richland County, Wisconsin. There is a similar fossil in the member collections...

http://www.thefossilforum.com/index.php?/gallery/image/8447-cryptozoon-rosmontensis/

Right next to that, I found this large laminated-looking, hollow rock thing.

Is it possible that this is a stromatolite that has not been recrystalized? Can stromatolites be hollow?

Thanks very much for looking,

Jann

Edited April 18, 2015 by Girquir

[abyssunder]

Holyrock1,2,3.jpg - reminds me about Ostrea(Oyster).

[Stocksdale]

I think the one from Mazon Creek is a piece of sandstone. The lines might be tidal rhythmites. Each little layer represents the tidal flow during one day with the darker lines being neap or spring tides. I know they've used these rhythmites to make some calculations of how quickly sea level rose in the Mazon Creek area.

The other ones are really cool looking but I don't have a clue about Stromatoporoids could also be a possibility.

Edited April 18, 2015 by Stocksdale

[Girquir]

Thanks for your replies. I had never heard of rhythmites, glad to know of this.