Is this a Coral Fossil

[captnkirk]

Found this in my gravel pile I got from a local Limestone Quarry. Only thing I could compare with makes it look like a piece of Coral. Came from SE Corner of Chautauqua County Kansas. Specimen is about the size of a half dollar.

 

[Ronstar]

When lava cools and hardens it has that same look. Specific to your question tho I cant say……

 

[Coin Rescue Inc]

For comparison here is an Amygdaloidal Igneous Basalt - From old Lava Flows and the bubble holes were filled with Minerals.
What you have is a much lighter color that appears to be limestone especially if found in a limestone Quarry.
Are the round items syphers or elongated stems like tiny pencils?

 

[captnkirk]

The Limestone item was extracted from a layer of rock ~ 50 feet deep. Definitely not a Lava extrusion and the center element(s) of the round holes are protruding above the surface of the stone. Since this area of the country was once a part of the ocean, I thought it might be a fossilized piece of Coral.

 

[Coin Rescue Inc]

Here is fossilized Coral for comparison want down by wave action - Petoskey Stones

 

[giuhalftrack]

As other write your sample is not a lava but some kind of sedimentary rock, the coral body in section looks like the wheel of an old carriage, so in your sample looks to me something more like worms..
consider that limestone was a mud in the bottom of the sea or a lake and that mud sure will have some form of animals living in.

p.s. I'm a geologist