Hi Karen,
Proving the existence of a "Crossley" in Co. Antrim appears to be an elusive task ...
No townland of that name, with or without the "e".
Crossley Street, Belfast lies securely in co. Down.
[It runs parallel to Castlereagh Street, linking Templemore Avenue with Clandeboye Street, all in the Eastern suburb of Ballymacarrett.]
Suppose, it might just be a hamlet ...
Perhaps its time to take a step back?
[Re-examine the evidence/assumptions and think laterally.]
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Could you be mis-interpreting the text?
Deciphering of scriptively written names can sometimes prove difficult.
Watch out for:
a) the initial capital letter being preceeded with a flourish;
[Sometimes quite florid.]
b) the remaining graphic of the initial letter sloping down steeply from left to right;
[With accompanying non-orthogonal orientation.]
c) the initial letter occupying a disproportionate length;
[As much as three non-capital-letters' worth.]
d) the legs of letters being drawn as loops, and not meeting at the top.
[Presumably to avoid smudging of the ink.]
This frequently results in scriptively-written names being interpreted as commencing with an "extra" second letter.
[Those commencing with an initial capital letter of "B", "H" or "M" seem particularly susceptible.]
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So, Perhaps the placename is "Mossley"?
This does exist.
It lies outside of Belfast, a few miles to the North.
It hosted a large cotton mill once.
[The factory went defunct, but the building is occupied as offices by Newtownabbey Town Council today.]
Your GGGM's marriage certificate should indicate her place of marriage and the occupations of some of the parties.
These might provide some support for the suggested re-interpretation above.
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Could the certificate be from the "wrong" continent?!
Port Fairy in Victoria, Australia was known as Belfast from 1843-1877. There seems to have been a town named Crossley nearby.
[... but then there was no Co. Antrim there then ... ]
Capt. Jock