protecting fossil limestone outside

Quoted text begins.Is there a product out there that would protect this sort of stone from the
weather?
End of quote.

Hi Ken,
There are many products that would solve your weathering problem, and it's
easy for me to suggest a few while situated remotely from you - ultimately
you must satisfy your own mind about the effectiveness of a treatment system
for your application.

3 adverse factors you must overcome if the limestone is to be located
outside are UV radiation, water (containing additional solvents) and the
sealer itself. A good sealer will block both UV radiation and water without
affecting the stone, however a maintenance regime must be identified and
adhered to.

Contact a local sealer manufacturer for further advice, and ask to see aged
examples of their specified product in situ.

One example of a fairly rigorous application test is here:
http://www.aldonchem.com/index.html

Simon