From the location map there appears to be more than 1 type. To identify them would need more photos of close ups of leaves, showing edges, and backs, to see venation serrations hairs etc, and buds or old fruit etc. Probably Prunus of various kinds.
abread111 I loaded 1 more photo taken from those trees in the foreground on the first photo which are all the same species; not sure whether that makes things clearer but I won't have the time to take more photos that you requested. And yes, I'd agree with Prunus. I recorded them to document that garden extensions are a not only a problem in terms of weed invasion. I will upload the young prunus that I removed yesterday from reserve land in the vicinity.
abread111 there are at least 2 different species, see Prunus sp. (A Plum) and Cornus (genus) (Dogwood) If I have the time I will have another proper check and take photos of parents and photos of close ups of leaves.
Thanks for the other photos but I think we should just leave it/them as Prunus species. There are 27 Prunus listed in https://keybase.rbg.vic.gov.au/keys/7461 and although some can be easily excluded there are still a lot of others which need flowers for id. CNM has 10 Prunus listed now and most are deciduous trees like these. The main problem is to get PCS to do something about the source trees in the reserve along the fenceline.