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ishoot308 · 12-11-2012, 09:16 AM

"they are ferromanganese nodules/concretions formed by groundwater seeping into the lake and precipitating out the iron and manganese dissolved within."

That's exactly what I was going to say it was!

Dan

12-11-2012, 09:16 AM	#14
ishoot308 Senior Member Join Date: Feb 2008 Location: Gilford, NH / Welch Island Posts: 6,348 Thanks: 2,416 Thanked 5,338 Times in 2,087 Posts	Just What I Thought! "they are ferromanganese nodules/concretions formed by groundwater seeping into the lake and precipitating out the iron and manganese dissolved within." That's exactly what I was going to say it was! Dan Last edited by ishoot308; 12-11-2012 at 10:53 AM.