I found fossil rocks like these in a very limited area in El Paso, TX. I am wondering if they have any value since I have not been able to locate any like these online.
Dimensions
3 1/3" x 2"
Acquired From:
Other
Coral and Bryzoa Fossil Stone. Pennsylvanian Period (323.2 million years ago–298.9 million years ago) Northern Texas, Southwestern United States. Dark fossil colony embedded in a limestone matrix. Measurements: 3 1.3 inch x 2 inch, unknown weight. This book, free to download from Project Gutenburg, looks to be a good introductory resource for the Texas region of the US for fossil identification. https://www.gutenberg.org/files/56315/56315-h/56315-h.htm