82 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1D21. 



LEAF RIVEK. 



Oil Leaf River the Byram marl appears on 

 the west bank at a fish trap half a niih^ below 

 the bridge on the Taylorsville-Silvarena road 

 near old Blakeney post office. The strata ex- 

 posed consist of only 2i feet of bluish lignitic 

 clay and fossiliferous blue sand, which form a 

 shelf-like bench near water level, but the sands 

 have yielded the large and characteristic fauna 

 wliich is listed under stations 5015 and 7376. 



WOODWAKDS. 



On Chickasawhay River at Woodwards, 2 

 mOes northwest of Waynesboro, about 5 feet 

 of blue or gray glauconitic shell marl composed 

 largely of Foraminifera and containing an 

 irregularly induiated ledge of gray limestone 

 is exposed beneath the bridge. The deposit 

 evidently forms part of the BjTam marl and is 

 probably very near the horizon of the shell bed 

 on Leaf River near Blakeney, which it resem- 

 bles. In addition to many Foraminifera, in- 

 cluding L( pidocijcJina ftnprra (Conrad), which 

 is characteristic of the Byram marl, the follow- 

 ing species have been collected: 



Station (i(i4S. ("hirkayawhay River at wagon l>i-idge one- 

 fourth mile West of Woodwards station, Wayne County, 

 Miss., C. Wythe Cooke, eolleetor: 



Bryozoa (2.5 species representini; 1!( genera). 



Lunatia sp. 



Dentalium mississippiense Conrad. 



Scapharca lesueuri I>all. 



Ostrea vicksburgensis Conrad. 



Peeten poulsoni Morton. 



Macrocallista sp. 



FAUNA OF THE BYRAM CALCAREOUS MARL. 



The following list includes only the corals, 

 mollusks, and echinoderms which are in the prin- 

 cipal collections of th(^ U. S. National Museum 

 from the B>Tam marl. The corals were named 

 by T.W. Vaughan. I identified the mollusks and 

 echinoderms and prepared the lists. The list in- 

 cludes 5 corals, 134 mollusks, and 2 echinoderms, 

 of which 80 occur idso in the Mint Spring marl, 

 46 persisted from the Red Blufl'clay (iiicltiding 

 6 which have not been found in the Mint .Spring 

 marl), and 54 appear to be peculiar to the By- 



ram marl. One of the most abundant and most 

 widely distributed species' is the little <SVa/>/(a/'ca 

 lesueuri D;dl, which appears to be restricted 

 to this horizon. The recent discovery at Vicks- 

 burg of a coral which Vaughan reports from the 

 coral reef at Bainbridge, Ga., from Tampa, Fla., 

 and from many places in the West Indies sug- 

 gests a closer relation of the Oligocene chert of 

 Flint River to the Byram marl than had hith- 

 erto been suspected. 



In jiddition to the corals, mollusks, and 

 echinoderms listed here, the accompanying^ 

 paper by Mr. Cushman adds to the fauna of the 

 Byram marl 68 species and varieties of Forami- 

 nifera from B\Tam alone, and it is certain that 

 study of all the material from other localities 

 now in his hands will atld greatly to this num- 

 ber. A monograph by Canu and Bassler^ 

 adds 45 Bryozoa to the fauna of the Byram 

 marl. 



Stations nf Ihr Bi/raiii marl. 



3722. Vicksliurg, Miss. Bluff just above second sawmill 

 on tlie river. Horizon No. 2 from top. T. W. \'aughan, 

 collector, 1900. 



3724. Vicksburg, Miss. Horizon aliove waterfall on 

 Mint Spring Bayou, near National Cemetery. T. W. 

 \'aughan, collector, 1900. 



3729. Vicksburg, Miss. Top of bluff opposite second 

 sawmill, slightly above second horizon. T. W. Vaughan, 

 collector, 1900. 



."ilU.'i. West Itank of Leaf Ri\er three-quarters of a mile 

 southeast of Pdakeney, Smith County, Miss. No. 2 of 

 .section. Nearest town is Taylorsville, which is aliout 8 

 miles south of Blakeney. G. C. Matson, collector, 1910. 



5(i23. B\Tam, Hinds County, Miss. West bank of Pearl 

 River. Includes all fossiliferous beds of section. G. C. 

 Matson, collector, 1910. 



()449. Confederate Avenue, \'icksburg. Miss., (KM) to 700 

 feet north of liridge over Glass Baj'ou. C. W. Cooke, col- 

 lector, Oct. 17, 1912. 



()4.">4. Pearl River just above bridge at ByTam, Miss. 

 C. W. Cooke, collector, Oct. 23, 1912. 



(Ubb. Pearl River at bridge at Byram, Miss. E. N. 

 Lowe, collector, September, 1912. 



7376. Leaf River, Smith County, Miss., half a mile below 

 the wagon bridge on Taylorsville-Silvarena road, near old 

 Blakeney pt)st office (same locality as 5G15). E. N. Lowe 

 and C. W. Cooke, collectors. May 22, 191.5. 



7385. Haynes Bluff, Wan-en County, Miss. L'pjicr marl 

 bed. C. W. Cooke, collector. May 17, 1915. 



' Canii, Fftrdinaiid, and Bassler, R. S.. North American early Tertiary 

 Bryozoa: U. S. Nat. Mas. Bull. 100, 1920. 



