Love it when a "lurker" loses her posting virginity. Welcome, welcome.
What a lovely description you provide. Can you tell us more about the soil? Was it influenced by the smell of clay? Did it seem cool and green or mossy? Was there a sense of decaying wood?
The first thing I thought of was a Demeter scent like Thunderstorm, then Hermes Terre d'Hermes and L'Ombre dans L'Eau.
UPDATE: Look at the reviews for Sel de Vetiver at makeupalley. I just dabbed on a sample of this I received recently. S-N-I-F-F. This might be close--salt sea air, vetiver for vegetation, maybe a hint of smoke, mild, classy. This might layer well with a tropical floral to give you the full effect without smelling like a drugstore aquatic fragrance.
Of course, you MUST keep us up to date on your trials.