Stone wall at Dover Castle incorporating fist-sized chunks of black flint.
Main entrance to Dover castle in the south of England.
Ancient Roman lighthouse from about 50 CE. The Romans used the local black flint, sandstone, and reddish Roman bricks in its construction. My children for scale.
The lighthouse was originally about 24 meters tall (80 feet). From this view, there is an arched doorway and two arched windows above. My son and daughter are standing at the base of the structure.
View from the top of The White Cliffs of Dover. The path is seen in the left and is light colored due the the local chalk. In the upper left are the distinctive white cliffs. The seam is a blue-green color. Visible that day, but not apparent in the photo was France.
On our trip to the UK, my son had the idea to walk the White Cliffs of Dover beach path and visit castles along the way. The cliffs and castles did not disappoint! Of course I was really excited about all that chalk! And black flint! And black flint used in ancient buildings! #EarthScienceTeacher