Revision of Lithostrotionella - USGS
Revision of Lithostrotionella - USGS
Revision of Lithostrotionella - USGS
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GEOLOGICAL SURVEY PROFESSIONAL PAPER 1247 PLATE 20<br />
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3 4<br />
PETALAXIS OCCIDENTALIS (MERRIAM) AND LONSDALEIA<br />
( ACTINOCYATHUS) BERTHIAUMI (MERRIAM)