Patty displaying a few of her recent flint finds. Click on photo to see more.
A biface is simply a large piece of stone that has been flaked off of the core, and then sharpened or shaped on both faces. This specimen many have been used as a hand axe.
Fossil snail embedded into limestone matrix. Note the quartz crystal filling inside the snail creating a geode-like interior.
Flint exposed at the surface
Black flint with blue tint and white limestone coating..
Collection of large flint spheres. Note the split geode filled with white quartz crystals. The largest pieces are 6”-9” in diameter.
Collection of large flint spheres. Note the split geode on the left filled with white quartz crystals. Next to it is a geode with a face. The largest spheres are 6”-9” in diameter.
Flint nodules encased in limestone matrix. Nodules are formed when silica rich oozes occupy holes and cavities in the sea floor. This piece is 12”-14” in length.
Click on image to enlarge. Large flint nodule on the left and a geode embedded into a large limestone boulder on the right. The geode is filled with white quartz crystals.
Her favorite collections.
Calcite Crystals & Limestone
Four inch layer of calcite crystals on top of karst limestone.
Various pieces of flint that may show signs of being shaped or worked.
Recently found rock showing concentric growth rings of flint. Note that the growth rings are different shades of brown.
Ledge Flint with Fossil Coating
Ledge flint is formed in layers within the limestone. The limestone coating the flint is full of fossil shells pieces. The is light brown or tan. Note the iron oxide coating creating the orange color. This likely formed recently at the ground surface.
Ledge Flint Cross Section
Side view of the ledge flint show the light brown or tan color.
This wood likely petrified on the seafloor. During floods, limbs of trees floated down rivers and into the ocean, They sank to the sea floor and were fossilized. This is a good indicator that the Cretaceous inland sea in which these rocks formed was near the shoreline.
May different shapes of flint discovered in the newly cleared cedar grove.
My interpretation is that during formation the limestone mixed with the silica rich flint material making the resulting rocks much harder. As a result these two pieces seem to be stuck together and showing different erosion rates.
Unusual Shaped Limestone
Another good example of the unique geology on this property.
Nice example of ledge flint. The limestone coating of the flint is full of fossil shells and tinted orange due to recent deposition of iron oxide. The interior flint is light brown. Patty recently donated this and other specimens to the Jacobs Well Nature Center.
This Gahagan knife made of Georgetown flint was made by a master flintknapper who lived about 1100 years ago. This artifact may or may not have been created as a functional tool. It was included as a grave offering that accompanied an Early Caddo leader buried in a special cemetery at the George C. Davis site in east Texas. It measures over 7 inches long. Excerpt from this Georgetown Flint article.
My rock collection from the 4th grade. The one on the left was picked up in a stream bed because it is shaped like a heart. It has polish to keep the red more vivid. The one on the right is a sandwich of mica and stone. No polish needed.
My Mom’s souvenir rock with location written on it. It reads, “Salt Lake City at Brad & Debbie’s house”. This was one of her last trips, the summer before she died of cancer on November 1, 2008.
Top - Patty’s collection from 4th grade.
Bottom - Her Mom’s rock with location collected.
Ledge flint at Jacobs Well Nature Center rock display.
Samples of flint Patty donated to the Jacob’s Well Nature Center.