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FIGURE 1. Map of the vicinity of Palenque including División del Norte and Belisario Domínguez quarries. The yellow areas show the outcrops of Paleocene marine strata identified here as Tenejapa-Lacandón unit (based on Servicio Geológico Mexicano, 2006a, 2006b).

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FIGURE 2. General views of the División del Norte ( 1 ) and Belisario Domínguez quarries ( 2 ). 3, A nodule in situ at División del Norte (between the black arrows). 4, Strata laminated in Belisario Domínguez quarry. 5, Gray silicified bands within the marl strata in a Paleocene non fossiliferous quarry near Palenque. 6, Plant or algae remains remains of Belisario Domínguez quarry.

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FIGURE 3. 1 , General view of the specimen IGM 4547, an anguilliform fish from the Paleocene marine strata at Belisario Domínguez quarry, Municipality of Palenque, Chiapas, Mexico. 2 , Close up of the posterior part of the trunk and caudal fin. 3 , Close-up of the region of the head and anterior part of the trunk. Scale bars equal 10 mm. Abbreviations: af, anal fin; br, branchistegal rays; cf, caudal fin; df, dorsal fin; op, opercle; pfr, pectoral fin rays; numbers show the position of each vertebrae.

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FIGURE 4. 1 , General view of the specimen IGM 4548, a clupeid from the Paleocene marine strata at División del Norte, Municipality of Palenque, Chiapas, Mexico. 2 , Close-up of the pectoral girdle. 3 , Close-up of the caudal region. Abbreviations: as, abdominal scutes; pcl, posclethra; pu1+un1, pural centra 1 and uroneural 1 fused to each other; numbers show the position of ribs and vertebrae. Scale bar equals 10 mm.

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FIGURE 5. Specimen IGM 4549, Phareodus sp. from the Paleocene marine strata of División del Norte quarry, Municipality of Palenque, Chiapas, Mexico. Scale bar equals 20 mm. Abbreviations: alj, articulation of lower jaw; op, opercle; pfr 1, first pectoral fin ray; psp, parasphenoid; arrows in the tail enclose the caudal principal fin rays.

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FIGURE 6. Specimen IGM 4550, a “Serranidae” fish from the Paleocene marine strata at División del Norte quarry, Municipality of Palenque, Chiapas, Mexico. Scale bar equals 10 mm. Abbreviations: afr, anal fin ray; afs, anal fin spine; dfr, dorsal fin rays; dfs, dorsal fin spine; mx, maxilla; op, opercle; par, parapophysis (in the vertebra 10); pcfr, pectoral fin rays; pmx, premaxilla; pvb, pelvic bone; pvfr, pelvic fin rays; pvfs, pectoral fin spine; smx, supramaxilla; numbers show the position of the vertebrae.

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FIGURE 7. Close-up and line drawing of the anterior dorsal region of the body of IGM 4550, a “Serranidae” fish from the Paleocene marine strata at División del Norte quarry, Municipality of Palenque, Chiapas, Mexico. Scale bar equals 10 mm. Abbreviations: dfs, dorsal fin spine; dpt, dorsal pterygiophopre; ns, neural spine; sn, supraneurals; numbers show the position of the vertebrae.

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FIGURE 8. Specimen IGM 4551, Pycnodus sp. from the Paleocene marine strata of División del Norte quarry, Municipality of Palenque, Chiapas, Mexico. Scale bar equals 20 mm. Abbreviations: cls, cloacal scale; cp, caudal peduncle; dmfe, dermocranial fenestra; drs, dorsal ridge scales; ms, modified bar-like scales; papr, parietal process; partt, prearticular teeth; vks, ventral keel scales; vt, vomer teeth.

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FIGURE 9. Paleocene map showing the distribution of localities with osteichthyan fossils (based on Weems, 1998; Arratia et al., 2004) (black and white concentric circles), the distribution of the craters of the multiple asteroid impacts in the mass extinction event of the Cretaceous-Tertiary boundary (black and white concentric stars), and the distribution of land and main marine sedimentary domains around Palenque (based on Meneses-Rocha, 2001, figure 12e).

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