Everything above this line is our work. This part is not.
The Barre district in Vermont, which the Vermont Geological Survey reckons supplies about a third of the monuments made in this country, is a granodiorite pluton roughly four miles long, one mile wide and ten miles deep, dated between 380 and 330 million years old. The consistency of that one body of rock is the reason grey Barre became the trade's reference stone rather than anything about the marketing.
The Elberton deposit in Georgia formed about 325 million years ago and tested at an average of 23,450 psi in compression across ten samples from seven quarries. Around ninety per cent of what comes out of it becomes cemetery memorials. Missouri's own granite at Graniteville, the state rock, is between 1.4 billion and 1.1 billion years old and went into the footings of the Eads Bridge.
What the trade quotes against itself. The United States Bureau of Mines held that while a great many trade names are applied to memorial stones, it had no data indicating that any one of them is more enduring than any other. Within the colours your cemetery permits, choose the one you want to look at. That is a better reason than any of the others.