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I'm even more convinced that those are crystals and not fossils and you have a porphyry. How fresh is the surface? Ideally you need to split open a big chunk of rock to get an unweathered surface to look at.
The only thing that bugs me is that those phenocrysts look more like hornblende in shape - but the colour is all wrong for it to be mafic, which is why I think it's a rhyolite.
Anyway - to be sure, crack it in half, give it a wet sloppy lick, and take another photo.
Cheers,
Andrew.
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