What sort of Ordivician trace fossil

[JUAN EMMANUEL]

Hi guys I found this trace fossil some days ago and I find this fossil a bit puzzling. I have no certainty as to what creature could have made this. This fossil is from Mimico Creek, Toronto, Georgian Bay Formation, Humber Member, late Ordovician. 

[JUAN EMMANUEL]

More pics

I see some sort two parallel burrows. What do you guys think?

[piranha]

They are arthrophycid burrows.  This paper has a few figured examples of Palaeophycus for comparison.

 

 

Stanley, D.C.A., & Pickerill, R.K. (1998)
Systematic ichnology of the late Ordovician Georgian Bay Formation of southern Ontario, eastern Canada.
Royal Ontario Museum - Life Sciences Contributions, 162:1-56  LINK