i was thinking more on the lines of a limestone bedrock tends to lead to clover etc while a basalt or granite bedrock doesnt sandstone seems to be under bog at me. i thought it tied to ph in the soil.
I might have this completely wrong tho. hence the question.
The geology, soil type, drainage and microclimate will
all influence what grows best there.
But I don't think any sweeping generalisations about geology
alone and nectar quality/quantity are likely.
The same plant, growing in different soil conditions will yield differently.
Soil moisture level affects the quantity, but seemingly not the composition of the nectar produced.
I've seen a reference to clover and boron in the soil. Changing the soil's boron concentration altered the fructose/glucose ratio in the clover nectar. Such subtle affects are probably why expert wine tasters can detect the difference between wines from nearby vineyards on different soil types. While the Bordeaux area is vast, some of the 'domaines' are truly tiny. One hive could forage over all the domaines of the Pomerol area, and a good bit of Saint Emilion too.
Unless you have a means of restricting your bees to some chosen "terroir", its all going to be blended in the hive and then again in the extraction. I don't see much scope for vineyard-style ultra-localised varietal honey!
But frankly, I'd say skip the middleman (geology). Look at the result - the plants that are growing in the area - that is what matters more than why they are growing there.
