>>1686750An european geo-anon here.
This anon isn't talking about any magmatic processes, but rather ophiolites which essentially means that a part of oceanic plate was obducted into or onto continental crust.
Something like this doesn't happen that often but it does appear and is plausible for this area.
>>1684325My guess is that there could be also some epidote in this stones, based on these pistachio green colors, in general the category would be metamorphic rock rather than magmatic.
>>1686338Yeah what
>>1686484 said, anything specific you want to know about? Deposition, fossiles, some details?