What is this?

[Fossilbuff]

I am a super novice and don’t know scientific names of these things.

This one was ound in creek in western Pennsylvania.  Lots of fossil stones around covered with black film... oil deposit nearby?  Most impressions in black stones are of shells and some plantlike things. This one is more like granite and the thing on top looks sort of like a giant guppy (to me).  What do you think?

[ynot]

Welcome to TFF!

I think You are right with "granite", well almost.

It is a granitic rock similar to granite, but the minerals are a little different than quartz, feldspar and mica, which make up granite.

The giant guppy is a remnant of a quartz body within the original batholith.

This type of rock forms deep underground and will never have fossils in it.

[Tidgy's Dad]

Agreed, it seems to be an igneous rock. 

Stained rhyolite, maybe. 

[Rockwood]

9 hours ago, ynot said:

This type of rock forms deep underground and will never have fossils in it.

Unless it is in the form of a xenolith.

[ynot]

2 hours ago, Rockwood said:

Unless it is in the form of a xenolith.

Still formed underground and will not have fossils.

[Rockwood]

1 minute ago, ynot said:

Still formed underground and will not have fossils.

Are you trying to tell me that granite has never intruded on a fossiliferous formation ?

[ynot]

1 minute ago, Rockwood said:

Are you trying to tell me that granite has never intruded on a fossiliferous formation ?

The conditions of the occurrence alters the included rock, so even if it did have fossils before it became a  xenolith, any fossils would be destroyed by the process

Either way the OP's  piece does not have a fossil in it..

[jdp]

Not totally convinced that's granite; Western PA is entirely sedimentary, and some western PA sediments look vaguely like that. If it is granite, it's a glacial erratic.