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Back Matter (PDF) Items listed in order of radiometric age Radiometric ages in this list have been arranged in order of increasing magnitude. If every age were exact, the list would correspond to the stratigraphical order of the Items, but since some determinations are imprecise or anomalous the list is only a first approximation to a true chronological order. Its purpose is to provide a summary of data, including that basic for the construction of a time-scale, and to assist in finding data in the Items when the approximate stratigraphical or radiometric age is known. Each entry gives the Item number, stratigraphical range (with the youngest rocks first), age (in millions of years), method used, and mineral (or rock) on which the determination was made. The abbreviations used are listed overleaf. Determinations on metamorphic or intrusive igneous rocks are indicated by an oblique stroke that separates the stratigraphical range of the metamorphosed and igneous rocks from that of any overlying rocks; e.g., Pliocene/Jurassic. This con- vention has not been adopted in the Items themselves. The values used have been standardized wherever possible (see the introduc- tion to the Items for details), and the Rb-Sr age listed is that determined from the A = I "47 × I0--11 Year-1 decay constant. In a given entry, ages determined by different methods have not been combined into a single average or mean age (as they may have in some parts of Part 4) but have been given separately. If, however, several approximately concordant ages have been found by the same method, the figure given for the age under that entry is the mean of these values. When ages are widely scattered, their range is generally listed, with the youngest age first. A few very anomalous ages have been omitted. In the latest stages of preparation, improvements in presentation of data sug- gested themselves, and it was decided that it would be helpful to adopt them, even though consistency between different parts of the volume would be reduced. Thus the presentation of the following data, although based on the Items, differ in several respects from them. The Geological Society Phanerozoic time-scale 1964 is summarized on pp. 260-3. 443 Items listed in order of increasing age ABBREVIATIONS USED FOR MINERALS AND ROCKS ab, albite hb, hornblende or, orthoclase ur, uraninite an, anorthoclase il, illite pl, plagioclase vat., various minerals, ad, adularia km, kolm pt, pitchblende rocks bi, biotite lp, lepidolite py, pyroxene xn, xenotime br, brannerite mb, molydenite sd, sanidine zr, zircon fi, feldspar mu, muscovite sy, sylvine ?, not stated gl, glauconite mz, monazite TR, total rock Note: Although/.7, M, and L generally correspond to the formally recognized stratigraphical sub- divisions Upper, Middle, and Lower respectively, they may also stand for the following: U, upper, late, top; M, mid-; L, lower, early, basal. Age Item Stratigraphical range (m.y.) Method Mineral lO 7 Plio-Pleistocene o" 95 K-Ar sat 243 Pleistocene (Irvingtonian) i- 36 K-Ar TR i o8 --/Plio-Plelstocene (?U. Blancan) i. 53 K-Ar bi 244 L. Pleistocene (Villafranchian)-Pliocene (Astian) 1.6i K-Ar TR 245 L. Pleistocene (Villafranchian) I75 K-Ar an 246 --/Plio--Pleistocene (?U. Blancan) I9 K-Ar bi 247 Plio-Pleistocene (?U. Blancan) 2 05 K-Ar bi 248 Plio-Pleistocene (U. Blancan) 225 K-Ar bi 3o9 Plio- Pleistocene (Blancan) 32 K-Ar TR 3o8 Plio-Pleistocene (Blancan) 33 K-Ar TR 249 Plio--Pleistocene (?U. Blancan) 33 K-Ar pl 250 Plio-Pleistocene (Blancan) 3"48 K-At pt, py 251 Pliocene (L. Blancan-U. Hemphillian) 4. I K-Ar TR 25 U. Pliocene 5.2 K-At gl 252 Pliocene (U. Hemphillian) 5.2 K-Ar fi 318 U. Miocene (~ Pontian) 6.1-7.6 K-Ar ? 253 Mio-Pliocene (Hemphillian) 6"4 K-Ar sd Io9 L. Pliocene (Tabanian)/U. Eocene 7.0 K-At ? Io9 L. Pliocene (Tabanian)/U. Eocene 7-o Rb---Sr var. 317 U. Miocene (L. Hemphillian-U. Clarendonian) 7'7 K-Ar ? 36 Pliocene (Scaldisian) 8"o5 K-At gl 254 Mio-Pliocene (Hemphillian) 8-i K-Ar pl 27 ° ~/U. Miocene (Clarendonian) 8- 9 K-Ar sd 255 Mio-Pliocene (Hemphillian) 8"9 K-At sd 256 Mio--Pliocene (Hemphillian) 9"2 K-Ar TR 28 U. Miocene (L. Hemphillian) 9.2 K-Ar bi 1 Io U. Miocene 9-6 K-Ar gl 271 U. Miocene (Clarendonian) 9"8 K-Ar TR 272 U. Miocene (Clarendonian) 9"8 K-Ar TR 258 U. Miocene (U. Clarendonian) 9"89 K-Ar pl 259 U. Miocene (Clarendonian) 9"9 K-Ar bi 257 U. Miocene (L. Hemphillian) 10"0 K-Ar TR 264 U. Miocene (L. Clarendonian) IO.6 K-Ar TR 26 U. Miocene (U. Clarendonian) lO- 7 K-Ar bi 26o U. Miocene (Clarendonian) lO- 7 K-Ar sd 266 U. Miocene (L. Clarendonian) lO. 7 K-Ar bi AAA Items in order of increasing age Age Item Stratigraphical range (m.y.) Method Mineral 265 U. Miocene (L. Clarendonian) xo.8 K-Ar bi 262 U. Miocene (L. Clarendonian) IO'85 K-Ar bi 261 U. Miocene (Clarendonian) I I "o K-Ar sd 263 U. Miocene (L. Clarendonian) I I "o K-Ar bi 268 U. Miocene (L. Clarendonian) x I. I K-Ar bi 27 U. Miocene (L. Clarendonian) I I. 1-I2 K-Ar bi 274 U. Miocene (Clarendonian) I x '4 K-Ar TR 269 U. Miocene (L. Clarendonian) x I "4 K-Ar bi 267 U. Miocene (L. Clarendonian) ix. 5 K-Ar sd 273 U. Miocene (Clarendonian) x x. 7 K-Ar TR 275 U.-M. Miocene (L. Clarendonian-U. Barstovian) i x .8 K-Ar bi, pl 314 - 'U. Tertiary' x3"4 K-Ar 313 'L. Pliocene' 14" o K-Ar 276 M. Miocene (Barstovian) x4" 6 K-At TR, pl 277 ) 312 L. Pliocene-L. Miocene x4" 6-15" 9 K-At ? 278 M. Miocene (U. Barstovian) x4. 7 K-Ar TR 279 M. Miocene ( ?L. Barstovian) x5" o5 K-At sd 38 M. Miocene (Barstovian) x5" 2 K-Ar bi 39 M. Miocene (Barstovian) 15" 2 K-Ar bi i28 L. Miocene (Hutchinsonian) 15" 4 K-Ar gl 28o M.-L. Miocene (Barstovian-Hemingfordian) 15" 4 K-Ar TR 28[ M. Miocene (Barstovian) x5" 4 K-Ar sd 282 M. Miocene ( ?L. Barstovian) x5" 6 K-Ar sd I3I 'U. Miocene' I6 Pb-a zr, mz, xn 40 ~/U. Oligocene x7" o K-Ar bi 79 M.-L. Miocene (U. Hemingfordian) 17 • 2 K-Ar bi 15o U.-M. Eocene 18 K-Ar gl I27 L. Miocene (Waitakian) x9" 4 K-Ar gl I29 M. Miocene (Waiauan) x9" 9 K-Ar gl i26 Oligocene (Duntroonian-Whaingaroan) 2o'8 K-Ar gl 8o L. Miocene (U. Arikareean) 2 I- 45 K-Ar bi I97 Oligocene (Whitneyan-Orellan) 2 I. 6 K-Ar ad 3IO L. Miocene (Santacrucian) 2 I- 7 K-Ar pl 8i L. Miocene-U. Oligocene (L. Zemorrian) 22"5 K-At gl 315 L. Miocene (L. Arikareean) 23"3 K-Ar 82 L Miocene (Burdigalian) 24"8 K-Ar gl 283 L. Miocene (L. Arikareean) 24"9 K-Ar ab I48 U.-M. Eocene 25 K-At gl 284 L. Miocene (Arikareean) 25"3 K-Ar TR 285 L. Miocene (L. Arikareean) 25"6 K-Ar TR 83 U. Oligocene (Whitneyan) 25"7 K-Ar sd I34 'U. Miocene' 26-24 ° Pb-a zr x49 U.-M. Eocene 27 K-At gl 286 L. Miocene (L. Arikareean) 29"5 K-At TR 287 Recent-L. Oligocene (U. Chadronian) 29"7 K-At I35 U. Miocene (Tongaporutuan) 3 °. 2-35" 8 K-Ar gl I46 U.-M. Eocene 31 K-Ar gl 23I L. Cretaceous (Upper Hauterivian) 31 K-Ar gl 288 U.-L. Oligocene (Whitneyan-Chadronian) 3 x. [ K-Ar sd III U. Eocene 3 i. 4 K-Ar gl 289 U.-L. Oligocene (Whitneyan-Chadronian) 3 I" 5 K-At sd 445 Items in order of increasing age Age Item Stratigraphical range (m.y.) Method Mineral 296 L. Oligocene (Chadronian) 3 I. 6 K-Ar bi 3xI L. Oligocene 3 I. 6 K-Ar TR I55 Oligocene 32 K-Ar bi 295 L. Oligocene (M. Chadronian) 32" 6 K-Ar bi 297 Oligocene 32" 8 K-Ar bi I5I U.-M. Eocene 33 K-Ar gl 84 L. Oligocene (Chadronian) 33" x K-Ar sd 292 L. Oligocene (L. Chadronian) 33"3 K-Ar bi 293 L. Oligocene (M. Chadronian) 33"7 K-Ar bi 85 L. Oligocene/M. Eocene 35 K-Ar bi I3O L. Oligocene 35 K-Ar sy 29 x L. Oligocene (L. Chadronian) 35"2 K-Ar sd, pl 23 U. Eocene (Kiev stage) 35" 6 K-Ar gl 294 L. Oligocene (M. Chadronian) 35"7 K-Ar sd, pl x47 U.-M. Eocene 36 K-Ar gl 299 L. Oligocene-U. Eocene (L. Chadronian- U. Duchesnean) 36" 5 K-Ar sd 125 U. Eocene (Kaiatan) 36" 6 K-Ar gl 29 ° L. Oligocene (L. Chadronian) 36"8 K-Ar fs 3oo L. Oligocene-U. Eocene (Duchesnean) 37' o K-Ar sd, bi, TR 298 L. Oligocene-U. Eocene (L. Chadronian- U. Duchesnean) 37" 5 K-Ar TR I32 'Oligocene-U. Eocene' 38 Pb--a zr, mz, xn I52 L. Eocene-Palaeocene 38 K-Ar gl I23 M. Eocene (Claibornian) 39 K-Ar gl I I 4 U. Eocene (Jacksonian) 39"4 K-Ar gl x x5 M. Eocene (~ Lutetian) 4 x "8 K-Ar gl 2 i8 L. Cretaceous (U. Albian) 42-82 K-Ar gl 124 M.
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