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
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