Looks like a knee socket type knob on this photos dont do it justice found with these
Any ideas anyone
Where & how did you find them? I take it the objects you are referring to are the two white ones with the tape measure. I have an idea but wait your reply.
JW 
Just sitting in a back eddy dead branch of a river that flooded last yr for the first time since records began or so they said , weighs about just under 3 kilo,
Just sitting in a dead branch of a river with heaps of didymo only things ya could see we’re them ,river hasn’t had a major flood like last yr since records began or so the news said, gotta b true if on news 
What area of the country?
JW
Halfway between chch and queenstown prob a bit closer to queenstown , but things got better for me washed these other scoria heavy porosity rocks from beach in sink took plug out and wtf pretty golden looking sand put monster on em it went nuts, took to pawn shop only 1 fitted in his machine machine only sees 10mm he reconed , but lead copper zinc count is pretty good he said. I will cut little one in ten mm stripped so he doesn’t
in morning he was pretty confident I will see gold man they are heavy.0llllll
What do ya recon the other thing is ??
A lighter. 
My first impression of the white object you first posted & you saying petrified had me thinking it could be a moa bone. I have found numerous moa bones. Which is why I asked the location. Moa of course were wide spread. Petrified bone is usually very worn & been through a hellish time & so doesn’t resemble the look of a bone or part of a bone but looks & feels more like rock.
In the pieces above. The large one has a gold looking wire sticking out. Are you thinking this is actually gold?
I don’t see the other rocks as being scoria at all.
JW
I thought moa bone originally but it’s a little to big , then thought Dinosaur but canterbury university say no, from a photo wtf no way to tell of a photo. I’m now thinking gold after studying aussie pieces totally encased in quartz all the little dimples and lines can be seen similar to gold pieces.im waiting for tomorrow take all to a place with niton xl3 xrf machine don’t really wanna break em up or drill em. The other rocks with all the holes I only found one photo of a
piece of porotic Scotia this colour from Alaska had been buried a long time.
Thats the biggest and best piece out of 8 pieces i have ,must weigh over 3 kilo.