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From the pex FAQs:Q: Can SharkBite PEX pipe be buried?

A: Yes, SharkBite PEX pipe is approved to AWWA C904 which covers PEX pipe in regards to burial. Be sure to check with local, city or state codes to see if the pipe needs to have sleeves or any type of protective burial for your area. PEX pipe can be used as a service line based on its corrosion resistance to soil and water, its long life, and its oxidative resistance.

Did someone encase cast pipe in concrete. mortar, etc... maybe a previous "epoxy repair"?
How far is it from the meter to the house? I'm afraid there are other sections of that pipe in similar condition. You may need to replace a lot of pipe.

edit;It is iron pipe. Now whether is galvanized or black iron I can't tell

I believe that sweated or threaded fittings are the only things permitted on gas line. Using a shark bite on gas is plain irresponsible and a danger.
Shark bites are dependable if proper pipe prep is done. Squared, clean, and debured cuts are needed.
Shark bite should not be used on the old Quest pipe (gray or white) used in mobile and prefabs in 90s and early 2000s (too soft)
When used on iron pipe underground rust will eventually deteriorate the connection. Above ground should be ok unless rust or other corrosion is already present,
Regular PVC requires special more expensive Shark bites,
CPVC (yellow or tan), copper and pex use the standard Shark bites.
Too the OP: Determine what type of pipe and how long the break is before making any decisions. If white pvc there are more options available. An old glued coupler may have pulled apart. We don't have very many copper pipe meter to house situations in our area. 90% are pvc or iron.