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Hi @patrick-hsieh, @mackenzie-smith might be able to help with ID here!

@patrick-hsieh and @mackenzie-ross-2 hard to say with only the sub-base and only secondaries. Definitely angionsperm (Magnoliophyta). If I had to give my best educated guess, it would be the genus Liriodendron (tulip tree). We have Cretaceous leaf records of this plant so the timing matches. In terms of characters, the arching of the secondaries, the fact that the secondaries can bifurcate and that the secondaries are eucamptodromous (they don’t reach the margin) are all things we see in the modern Liriodendron. The main give-away would be the apex (leaf top) which has a wide, triangular notch cut out. Their overall shapes varied much more in the Cretaceous than they do in Eastern North America today.