I was wrong.
Quercus robur is the oak of the deep, rich soils and protected coves of Western Europe...the cozy Western Europe of Thomas Hardy. Quecus petraea is the oak of the shallow soil, of windy exposed knobs and of stony, acidic soil. That would be the western Europe of the Bronte sisters and the Hounds of Baskerville.
===>This essay<=== explains how to determine if an oak specimen is Q. robur, Q. petraea or a nominal hybrid between the two.
|Six specimens collected form my property. Roughly sorted, more robur like on bottom-right corner, more petraea like in upper-left corner.|
|Bottom right specimen: Petiole and auricles suggest pure Q. robur|
|Top-middle specimen, longish (9% of leaf length) petiole and lack of auricles suggests that this specimen is not pure Q. robur.|