Trace fossils
(ichnofossils)

Some geologic Stratas have zones with large amounts of bioturbated deposits or in filled burrows.  The larger in filled burrows can resemble bones and are mistaken as such by newer fossil hunters.  They are often seen at the transition between softer and harder sediments.
nest?  [+] Strata:  Graham (upper Finis shale) Period: Pennsylvanian (c. 300 mya) Loc: Jack Co., TX. 2014.	nest? Strata:  Graham (upper Finis shale) Period: Pennsylvanian (c. 300 mya) Loc: Jack Co., TX. 2014.
"digitating feeding probes" Strata:  Graham (Jacksboro limestone member) Period: Pennsylvanian (c. 300 mya) Loc: Jack Co., TX.  Oct. 6, 2009.	Trace fossil Strata:  ?? Period: Pennsylvanian (c. 300 mya) Loc: Jack Co., TX.  26 Jan 2020.
Fossil burrows in sandstone Strata:  Wolf Mountain Shale [sandstone] Period: Pennsylvanian (c. 300 mya) Loc: Palo Pinto Co., TX.  27 Jan 2024.
Fossil burrows in sandstone Strata:  Brazos River Period: Pennsylvanian (c. 300 mya) Loc: Palo Pinto Co., TX.  May 3, 2014.

Fossilized ripple marks

Strata:  Mineral Wells Fm. Period: Pennsylvanian (c. 300 mya) Loc: Palo Pinto Co., TX.  27 Jan 2024.