Hardwood tree identification

I went on another walk today and decided to take pictures of a few different hardwoods that are found on my land. These trees are what most of the woods were made up of a couple hundred years ago. Hardwoods are all deciduous which means they loose there leaves in the winter unlike evergreens and most pines. Hardwoods range from Maples to Cherries to Williows. I have some pictures of a few Hard woods below and how to identify them.

This is a picture of a Black Cherry trees bark. This is  a very easy way to tell it is a black cherry as the bark is very dark and is chipping like flakes. These trees are very expensive hardwoods for two reasons one they have a unique wood color and 2 they usually don't grow straight for very long so it is hard to make lumber out of them. 

This is a picture of a Red Maple, The bark is smoother than that of an ash and makes as the tree gets older plates form on the bark. 

This a picture of a type of hawthorn most likely a Pear Hawthorn, but Hawthorns are very complicated to distinguish between others and a lot are varieties of the pear hawthorn I will just call this a Pear Hawthorn. Hawthorns are easily identifiable as they have HUGE thorns and are very sharp. 

A neat feature of the hawthorn is it's thorn. The northern Shrike is a predatory bird similar size to a jay and since they do not have a very strong ripping power with there beaks they sometimes use Hawthorns in order to skewer their prey and then tear it apart using the thorns as leverage.  

Also on my walk I decided to lay Stakes out for my Transect line as this will allow me to follow the path much more clearly than how I am currently able to. I am thinking of putting around 20-25 stakes on the transect and i'm not sure if I will tie a string around them or not. I am thinking of having the stakes represent spots where I put a meter square down and record the flora that I find there. This would make it very easy to keep a record on where I am plotting surveys.