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Showing results for tags 'chalk canyon formation'.
This silicified lacustrine Miocene stromatolite is a trace fossil made by a gram-negative photosynthetic blue-green bacteria. The originally limestone stromatolite was formed as a bacterial mat trapped sediment and precipitated limestone as it grew from the lake floor towards the sun. It shows classic convex layering towards the top. The stromatolites occur in tuffaceous and lime rich lake sediments that might be part of the Chalk Canyon Formation that is bounded on the bottom by basaltic lava and volcanic rich conglomerate and sandstone on the top. Locally numerous silicified cast
Here are some more lake wetland Miocene plant fossils from NE of Phoenix. I found large outcrops of silicified reeds in growth position. I found several pieces of palm: a first for this area. Photos 1 & 2: palm. Photos 3 & 4: top and bottom of reeds. Photos 5 & 6: more reeds.
I found these in a Miocene lake bed formation northeast of Phoenix, Arizona. The lake beds are deposited along with volcanic rocks and are probably part of the Chalk Canyon Formation. The lake beds have pieces of agatized plant material. Any ideas of what the plants might be? I am especially interested in the molds of a jointed plant shown in the first three photos. @paleoflor Photo about 6cm high. Detail of first photo. Filled center of plant stem ~0.7mm. Depressed mold of stem ~ 3mm across. Height of photo ~2.5cm. Detail of first