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ZONATION OF THE CRETACEOUS OF CENTRAL COLOMBIA BY AMMONITES 9 (495 (et). Two members are described in de-' tail: {iij thQOTfiA -rlrIT'J.'l .-,E,;.f,_:--.... -... TION measureu aoou .., me rs " teeL1 norou of culvert No. 19 [Km 3+220) on the new road Anapoima·Apulo. XI Argillaceous limestone bed • . . . . 0.15 m or 0.49 feet. . X Variegated calcareous shales with reniform calcareous concretions, or lens-like argillaceous limestones. At base of this segment, "fP sample C • 199 yielded !llw.clites obli· - quum (Riedel) . • • . . . . 8 m or 26 feet. IX Calcareous shales with lenses of argillace· pus limestones; crushed ammonites,bival· ves; altop sample C • 200 yielded Riedeli· "'-' tes obliquum (RiedeQ . . 1.8 m or 5[eet VTII Argillaceous limestone lens ..... 1 m or 3.3 feet. vn variegated shales, with intercalations of thin layers of very fine grained calcareous and quartzitic sandstones, with bands rich in fragments of cephalopods and bivalves ................. 8 m or 26 feet. VI TOP Quartzitic calcareous sandstones, very finely to finely grained in parallel layers of 0.001 m (or 0.003 feet); calcareous concretions are locally present, they contain crushed ammonites and bivalves . ... 11.50 m or 38 feet. V Quartlitic calcareous sandstones, fine to very fine grained, laterally tending to appear massive, but regularly occurring in parallel or wavy, fine to very fine layers of 0.001 m (0.003 feet) thickness, locally with calcareous concretions surrounded by fragments of cephalopods or bivalves or coarse quartzitic sand . • . . 15.50 m or 41 feet. [V Light gray quartzitic, fine grained sands· tone, massive, 1 m (3.3 feet? thickness, with interspersed calcareous concretions . . . . • 1 m or 3.3 feet. UI Quartzitic siltstones with intercalations of very fine grained sandstones; predominan· tly parallel laminae of 0.001 m (0.003 feet) thickness. Locally there are lenses with rounded quartz grains up_ to 0.005 m dia· meter and crushed ammonites and bival· ves. Some lenses of limestone also occut . • 7 m or 23.5 feet. II Calcareous quartzitic siltstones to very fine grained sandstones with subparallel to wavy lamination; calcareous concre tions with fragments of cephalopods and sporadic rounded quartz grains up to 0.001 m diameter . • . . . . • . . 7.30 m or 24 feet. BASE Dark gray shale . . • • • . 4.5 m or 15 feet. .. REFERENCE SECTION. SOCOTA MEM· BER. The base of the measured section is · near the culvert at K 4 + 06. Variegated shales, partly covered. V TOP. Dark gray, quartzitic sandstone, calcareous, very fine grained to fine grained, locally medium grained.Subparallel lamination, with calcareous concretions which seem to merge in to the envelop ping surrounding rock; fossiliferous: at 1.4 m (4.6 feet) from top, sample C-220yielded: ' G_olombiceras sarmientoi n. sp. r. Xcantliohoplites bigoureti(orme n. sp. i Clieloniceras(Epicheloniceras) pardoi n. sp. at-4--m (13.2 feet) from top, sample C-222 yielded Ridelite!i_ esthersemae n. sp . • . . • 5.5 m or 18'"'fee C;· ,"-·
10 F. ETA YO -SERNA coarse grained sandstone occur and the rock tend to become massive . 7.1 m or 23.4 feet. I Alternation of calcareous lenses up to 0.5 m (1.65 feet) thickness, which enclose abundant fragments of cephalopods and bivalves and also has rounded grains of quartz up to. 0.001 m diameter, in &;Iternation w1th sdtstones beds or fine gramed quartzitic sandstones • • • 4.15 m or 13.7 feet. The Socota Member is a particularly interesting unit; it is missing toward the southwes· tern part of the region but it increases notably in thickness and areal distribution northeastwards. amrtWrdJf:·dAlf?ro;rt!f·e SECTION of its basal beds was measured adjacent to the house of Hacienda Capotes. This name was introduced by Caceres and Etayo Sema (1969, p.5), without description of type section. This unit can be recognized by the frequent occurrence of argillaceous, thinly bedded limestones or the abundance of highly fossiliferous calcareous concretions up to 0.5 m in diameter distributed in layers; the top of this unit is marked by the dominance of clay-shale with frequent occurrence of small argillaceous to slightly calcareous concretions. Section of the basal beds of the Capotes Member measured along the road from the casa of Hacienda Capotes to Japon, it begins inmediately adjacent to the house. VIII Argillaceous limestone • • . 0 feet. .5 m or 1.65 VII Variegated shales with calcareous concretions; just above the underlying limestone, sample C-255 yielded : j Lyel/iceras pseudolyelliforme n. sp. i Lyelliceras isaacleai n. sp . ..t:. Hypophylloceras wiedmanni n. sp . • . 2.5 f m or 8.25 feet. VI Argillaceous limestone thinning and wi· dening irregularly; sample C-255 x yielded: "! Ne odehayesites columbianus (Riedel) . • • 0.5 m or 1.65 feet. V Variegated shales with interspersed calcareous concretions; argillaceous limestones separated by variegated shales, with crushed ammonites . . . . 1.8 m or 5.9 feet. IV Variegated shales with lenses of limestone up to 0.5 m (1.65 feet) thickness . . • . . . 2.7 m or 8.9 feet. • . Ill Argillaceous limestone that tends to split in thin layers . . . . . . 0.8 m or 2.6 feet. II Variegated shales . . . 2.5 m or 8.2 feet. I Argillaceous limestone . 0.8 m or 2.6 feet. REFERENCE SECTlON of the bottom of the Capotes Member, ·measured . aetnebegiilning of trail to the power transmission tower, just west of village of Tarapaca. II Dark gray shale; three intercalated layers of fossiliferous concretions. Sample C-12 yielded : Neodeshayesites co/umbianus (Riedel) . .. . . . . . . . . 1.2 m or 4 feet. I Dark gray shales with very fine argilla· ceous limestone beds and calcareous concretions with crushed ammonites. 25 m (82.5 feet) below sample C-12, sample C-13 yielded: Trochleiceras juliverti n. sp. Douvilleiceras tarapacaense n. sp. Carloscaceresiceras caceresi n. sp. BASE . . . . . . . . . . . 60 m or 198 feet. Hard, red-brick, Trigonia bearing limestone (Trincheras Forrnation). At this geographical point the Socota Member is absent. REFERENCE _SECTION for basal part of the Capotes Member and'underlying units; this section was measured at Cerro Bejucal, from the machinery house of the limestone mine, and extending SE along the abandoned road. VIII Gray shales, sporadic calcareous concre· tions . . . . . . . . . . . 50 m or 165 feet. VII Variegated shales with gypsum veinlets, calcareous concretions and thi n fossiliferous limestones. At top of these shales, sample C-169 yielded: - Rinconiceras rinconi n. sp. _.., Pla tiknemiceras colombiana n. sp . .,. Ca rloscaceresiceras sp. . 30 m or 99 feet. VI Variegated shales with gypsum veinlets, calcareous concretions and thin fossiliferous limestones. At top, sample C-170 yielded: 'l' Eodouvilleiceras pedrocarvajali n. sp. ,.. Neodeshayesites columbianus (Riedel) _ J)·o chleicerasjuliverti n.sp. 12m or 40 feet. V Variegated shales with frequent calcareous concretions and lenses of fossiliferous limestones . . . . . . . . . . . 9 m or 30 feet. IV Variegated shales with gypsum veinlets and locally abundant gastropods and bivalves bearing concretions .... 27 m or 89 feet. III Dark gray shales . ... 200 m or 660 feet. II (Socotii"'·Member). Quartzitic graded bedded sandstones; large blocks of limes - tone . . .Du(renoyio codazziano (Karsten) . . . . . . . . . . · . . . ... . 10 m or 33 feet.
Page 1 and 2: Publicaciones Geolo_gicas Especiale
Page 3 and 4: PUBLICACIONES GEOLOGICAS ESPECIALES
Page 5 and 6: CONTENTS ABSTRACT . . . . .. . . .
Page 7 and 8: Pl ate 4. Plate 6. Plate 6. Plate 7
Page 9 and 10: 2 F. ETA YO· SERNA The materials t
Page 11 and 12: 4 F. ETA YO· SERNA PHYSICAL STRATI
Page 13 and 14: FIGLH 1\ 2 2AJ Vl:LLA DE LEIVA CD -
Page 15: 8 Gloriaceras paulinae n. sp. Zumpa
Page 19 and 20: 12 F. ETA YO · SERNA trated in sev
Page 21 and 22: 14 F. ETA YO · SERNA ated. In the
Page 23 and 24: 16 F. ETA YO · SERNA TABLE I ASSEM
Page 25 and 26: 18 F. ETA YO ·SERNA tion consisfli
Page 27 and 28: 20 F. ETA YO ·SERNA increasing ove
Page 29 and 30: 22 has a subelliptical to subcircul
Page 31 and 32: 24 F. ETAYO ·SERNA rounds abruptly
Page 33 and 34: 26 F. ETAYO · SERNA ffer, 1963, p.
Page 35 and 36: 28 F. ETA YO - SERNA this is partic
Page 37 and 38: 30 F. ETAYO ·SERNA and bifurcate;
Page 39 and 40: 32 F. ETA YO · SERNA thirds of the
Page 41 and 42: 34 F. ETA YO · SERNA Hypotype. (U.
Page 43 and 44: 36 F. ETA YO - SERN A tuberculation
Page 45 and 46: 38 F. ETAYO - SERNA they project sl
Page 47 and 48: 40 last whorl the ribs are inconspi
Page 49 and 50: 42 Hypacanthoplites dognaliciae n.
Page 51 and 52: 44 F. ETA YO · SERNA One large spe
Page 53 and 54: 46 F. ETAYO - SERNA "Acanthoplites
Page 55 and 56: 48 F. ETA YO · ERNA These tubercle
Page 57 and 58: 50 .,CQ.IQmQ.ik.er::fJ§. W forg.ro
Page 59 and 60: 52 Among the subsequent flared ribs
Page 61 and 62: ZONATION OF THE CRETACEOUS OF CENTR
Page 63 and 64: ZONATION OF THE CRETACEOUS OF CENTR
Page 65 and 66: zoNATION OF THE CRETACEOUS OF CENTR
Page 67 and 68:
zoNATION OF THE CRETACEOUS OF CENTR
Page 69 and 70:
ZONATION OF THE CRETACEOUS OF CENTR
Page 71 and 72:
? ? ZONATION OF THE CRETACEOUS OF C
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
zoNATION OF THE CRETACEOUS OF CENTR
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Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
86 F. ETA YO - SERNA rent localitie
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88 The adapical end of this conch h
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90 F. ETAYO · SERNA dies out near
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92 OCCURRENCE. La Frontera Fonnatio
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94 re is an asymmetrical sulcus bor
Page 101 and 102:
96 (1898, p. 198, figs. 23a,b,c), w
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98 the flank and have a periventral
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100 F. ETA YO - SERNA On the adapic
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102 ventral third of the whorl side
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104 but "Fundort: Von Stiibel im Be
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106 F. ETA YO · SERNA En dos regio
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108 In due regioni della Cordiglier
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110 REFERENCES ANDERSON, F. M. 1938
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112 -- 1963.- Atlas des fossiles ca
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114 KARSTEN, H. 1858.- Vber die geo
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116 Colon. Geol. min. Resourc., uol
Page 123 and 124:
118 F. ETA YO • SERNA WIEDMANN, J
Page 125:
120 A) B) C) D) E) F) G) H) I) L) M
Page 129:
124 F. ETA YO • SERNA A) B) C) D)
Page 133 and 134:
FIGURA 7 A Q 8 ) / ! E I c K FIGUR
Page 136 and 137:
132. A) B) C) D) E) F) G) H) I) J)
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134 Scatter diagram of the distribu
Page 140 and 141:
136 Scatter diagram of the relation
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Page 144 and 145:
140 F. ETA YO · SERNA Scatter diag
Page 146 and 147:
Page 148 and 149:
144 F, ETAYO ·SERNA Scatter diagra
Page 150 and 151:
146 F. ETA YO · SERNA FIGURE 16 Sc
Page 152 and 153:
148 F. ETA YO · SERNA Scatter diag
Page 154 and 155:
PLATES 1-15
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154 F. ETA YO · SERNA Fig. 1) Chel
Page 161:
158 F. ETA YO · SERN A PLATE 4 Fig
Page 165:
162 Fig. 1) Vectisites (Zambranoite
Page 169:
166 F. ETA YO · SERNA Fig. 1) Eodo
Page 173:
170 Fig. 1) Carloscaceresiceras cac
Page 179:
176 Fig. 1) Fig. 2) Fig. 3) Fig. 4)
Page 183:
180 Fig.1) Codaziceras scheibei (Ri
Page 186 and 187:
184 Engonoceras, 74. duartci, n. sp
Page 188:
186 Tegoceras, 82. benavidescaceres
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Publicaciones Geolo_gicas Especiales Del lngeominas

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