Hell if I know. I've been doing some image searches and coming up blank. How dense were the flowers? Fairly sparse, or do you think "Look at all those flowers" when you see it? Did the flowers have a scent?
How about Halesia tetraptera or monticolaalso known as Caroline Silverbell, generally zone 4 - 8, but good specimen in Orono, Maine. Generally 30-40 ft tall, but co-champions in GSM National Park are 104,103, and 96. Fruit is a 4 winged corky drupe, flowers are showy white, 4 petaled, bell shaped 3/4 to 1 inch long.
Excellent reference to have is Virginia Tech Tree ID. Free app for phone or tablet.
Not really. One of the branches was low, and I saw a proto acorn forming. It looked shaggy around the base(similar to a full grown sawtooth oak acorn), but it was so young, extrapolating may be inaccurate. Regular oaks could look like that. I never really noticed when they were just starting to form.