Palynology of Middle Tertiary lacustrine deposits

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181 Fig. 3 Grey clay with impressions of leaves which still yield part of their preserved cuticles. SQUthwest of Major I'orter. Jos Plateau, former drainage systems. The Sabon Gida South granite. which has undergone particular deep decomp(l$l' lion and greisenization is exl)O!ied in the mine. Its deeply weathered, rugged surface has an overburden of unsorted gravels and gritty clays. which are covered by Oil ton· spicuous bed (ca. 30 em) of a dark silly clay. This rock breaks readily when dried into thin, fmely laminated layers whkh expose well preserved impressions of simple leaves with entire margins, oval and ovate shapes. rounded or acute bases and tips (fii. 3). The cuticles an! preserved. It is tis hori:on from where the samples for pa}ynoIogic investigation were taken. Tn the subsequent tables some properta of this dark clay are listed. Granulomwic char.lcteritiC$: Coarse sand (5.8X). fme sand (3.1"). CDane silt (2.6"l. medium Sill (6.4"l. fine silt (15.4">. and clay (66.1"). Mineralogical composition: Quartz. clay minerals of the kaolin group(l\aIloysite. metahalloysite) . Main clements (EOAX): AI. Si. S, Ti. Fc. Combustible componenti!l: 6.3% d" C of organic carbon (POS): -29.5~ Moist conditions are necessary for the stability of hal10ysite which is fonned as a product of weathered igneous rocks in a substrate with low pH due to the presence of humic acids. The occurrence or this typical exogene mineral fits well with the
188 K. TAKAHASHI & U. JUX -.- Ferruginous sand ~-=====_ ::
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Page 11 and 12: 190 K. TAKAHASHI & U. lux 1982 Leio
Page 13 and 14: 192 K. TAKAHASHI & U. lux Triplanos
Page 15 and 16: 194 K. TAKAHASHI & U. lux Width / l
Page 17 and 18: 196 K. TAKAHASHI & U. lux Late Olig
Page 19 and 20: 198 K. TAKAHASHI & U. lux 1967 Laev
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Page 31 and 32: 210 K. TAKAHASHI & U. jux 50 - 56 p
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Page 37 and 38: 216 K. TAKAHASHI & U. JUX Querco£d
Page 39 and 40: 218 K. TAKAHASHI & U. lux Darmstad)
Page 41 and 42: 220 K. TAKAHASHI & U. lux Tricolpop
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238 K. TAKAHASHI & U. jux Remarks:
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240 K. TAKAHASHI & U. lux Diagnosis
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242 K. TAKAHASHI & U. lux Remarks:
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244 K. TAKAHASHI & U. lux geniculus
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246 K. TAKAHASHI & U. lux n. comb.
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248 K. TAKAHASHI & U. lux Botanical
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250 K. TAKAHASHI & U. JUX 1969 Sapo
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254 K. TAKAHASHI & U. lux Turma Por
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256 K. TAKAHASHI & U. lux PI. 15, f
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258 K. TAKAHASHI & U. lux Measureme
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260 K. TAKAHASHI & U. lux PI. 16, f
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262 K. TAKAHASHI & U. lux smooth; e
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264 K. TAKAHASHI & U. lux Measureme
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268 K. TAKAHASHI & U. lux like, l,u
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270 K. TAKAHASHI & U. lux porus vis
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Palynology of Middle Tertiary lacustrine deposits

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