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Generalized Geologic Map of Pagan. Mariana Islands

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Generalized Geologic Map of Pagan. Mariana Islands GENERALIZED GEOLOGIC MAP OF PAGAN. MARIANA ISLANDS ". '0 ' EXPLANATION ~ Ro,sedreefs ~ PCSf· cOldero lovos ~ POsl-cotdero l0vos ...lhmgnlt eof osh ~ Posl·coidero oshond 'ulf Ie P,r- coiderosuccu$ion .* C,nde, conn .~"'< ".....J Crol er 01 volCono ~ 0 4 3 FOS$,l locollly F'ou,' nOlrd bu l no! eouectee ,~ 10 00 500 .0 0 0 ". oe o ce'. e l F IC o C £ AN \ \ . T , ~ . " · ""...,. , C -4.. e c , " ( ~ I S L .. ~ 0 s FIG. 1. Generalized geologic map of Pagan, Mariana Islands. A Fossil Flora from Pagan, Mariana Islands' F. R. FOSBERG2 and GILBERT CORWIN3 PYROCLASTIC DEPOSITS on Pagan, northern elevation of 3,136 feet is at the summit ot Mariana Islands, contain numerous plant im­ Agrigan Volcano. pressions. During geologic investigations in Pagan consists of two active volcanic cen­ 1954, ten collections were made for subse­ ters located within broad circular depressions quent identification and study. Seventeen (calderas) that are connected by a high rugged plant species, all of which now live in the isthmus . It has an area of 18.4 square miles Ma rianas, have been distinguished. and a greatest elevation of 1,890 feet near the The geologi c investigations of Pagan were south end of the isthmus. undertaken by a field party of the Office ofthe The northern caldera is 3Y2 miles in diam­ Engineer, U. S. Army Forces, Far East, staffed eter and has one large central cone, Mt. by members of the U. S. Geological Survey. Pagan, that has an elevation of 1,855 feet. 1. D . Bonham of the field party first noted Relatively recent basalt flows are extensive the plant fossils. Gilbert Corwin, with the aid and form broad plains north, east, and south of M. ]. Terman, also of the field party, and of the volcano; ash is concentrated to the Santiago V. Castro, a resident on the island, west (leeward). collected samples and made field studies of The southern caldera is about 1Y2 miles the fossil localities. Fosberg has identified, across. South Volcano within it consists of studied, and described the plant impressions. four coalescing cones, three of which have broad steep-sided craters. Rough lava plains LO CATION AND GEOGRAPHY bound the volcano on the north, east, and Pagan Island is near the center and is the south. To the west the volcano slopes directly largest of the northern Mariana group. It lies to the ocean. between latitudes 18°01' and 18°11' North The isthmus ranges in width from about Y2 and between longitudes 145°41' and 145°49' mile at the north end to 1 mile at the south East, about 280 miles north of Guam and end. Northward along the crest of the isthmus, 1,100 miles south-southeast of Tokyo , Japan the peaks become successively lower. The (Fig. 1). caldera backslopes north of the isthmus are The northern Mariana Islands form a chain dissected by numerous valleys directed away nearly 300 miles long that consists of the from the rim of the northern caldera. summits oflarge volcanoes rising from ocean The volcanic rocks have been divided into depths of as much as 6,000 feet. Uracas two major groups: pre-caldera and post­ (Farallon de Pajaros) at the north end is one caldera. Both consist of flows and pyroclastic of the most active volcanoes of the western rocks . Pacific. Pagan, Asuncion, Agrigan, and Gu­ The older, pre-caldera group is well ex­ guan have had eruptions since 1900 (Tana­ posed in the caldera walls, along the coasts kadate , 1940). The islands are generally small, ofthe isthmus and southern end ofthe island, relatively high, and rugged. The maximum and in old sea cliff remnants north and north­ 1 Publication authorized by the D irector, U. S. east of Mt. Pagan (Fig. 1). The lavas and Geologic al Survey. Manu script received March 4, 1957. pyroclastic rocks are products of eruptions by 2 Botanist, U. S. Ge olog ical Survey, Washingron 25, D. C. at least four major volcanoes and a number of 3 Geologist, U. S. Geological Survey, Tokyo. minor vents aligned along or near the axis of 3 4 PACIFIC SCIENCE, Vol. XII, January, 1958 the island . The largest of the old volcanoes dryness as of an extremely porous substratum was probably in the position of the present and of the pioneer nature ofvegetation, which Mt. Pagan. The uppermost unit of the suc­ occupies surfaces of recent volcanic ejecta. cession is composed of a widespread thick In the very few low, wet areas, such as to the tuff-breccia sequence. west and southwest of the Inner Lake, The pre-caldera group is probably of late thickets of broad-leafed trees are luxuriant Quaternary age. Sea cliffs have been cut in the enough, and places bordering the lake are breccias and older deposits; and reef lime­ somewhat marshy. Luxuriant patches of stones, some of which are now as much as 5 woods also exist in hanging valleys on the feet above present sea level, have since been west side of the south end of the island. A deposited on the wave-cut platforms. Similar mixed scrub forest of low stature forms sea cliffs flanked by terraces and raised reef thickets and patches up to several acres in limestones have been noted on the coasts of extent on plains north and south of Mt. many Pacific islands and are attributed to Pagan - extending up its lower slopes in erosion and deposition during post-glacial places on steep slopes on the west shore of high stands of sea level. Sea levels 5 to 12 the isthmus, and in numerous ravines through­ feet higher than the present one have been out the island . There has been no investiga­ assigned various dates ranging from about tion of the actual composition of this forest, 1,000 to 5,000 years ago. Some plants that but it contains 15 or more species of trees. may have been introduced by man are rep­ The loose volcanic ash that covers large resented by impressions in samples collected areas, especially on the west side, is largely from the upper breccias and therefore may vegetated by an almost pure stand of sword­ indicate a maximum age for these breccias of grass, Miscanthus floridutus (Labill.) Warb . about 4,000 years-the probable length of This forms a coarse, harsh, brake-like grass­ time since the advent of man in Micronesia land 1 to 3 m. tall and very dense in places. (Spoehr, 1955a, 1955b). On the steepest slopes and above 250 m. The post-caldera succession is concentrated altitude this grass tends to be shorter and within the calderas. At some places lavas have the clumps more widely spaced. Above 450 flowed over the caldera rims; tuff as much as m. it is sparse to absent. 30 feet thick mantles large portions of the Lava flows may be practically bare, as on caldera blackslopes and the isthmus. the northeast side of Mt. Pagan ; they may Historic records of eruptions are scattered, support scattered clumps of Miscanthus and conflicting, and incomplete. It is likely that trees of Casuarina, as on the east and south­ several major eruptions have taken place east sides ofMt. Pagan and the central upland within the past 200 to 300 years. Marche of the southern part of the island; or, as on (1891: 261) states that a major eruption oc­ many of the flows and lava cliffs to be seen curred in 1872. Extensive lavas northeast and along both sides of the island, they may be southwest of Mr. Pagan and a thick tuff covered by almost pure forests of Casuarina. sequence to the west were probably deposited Casuarina and the fern, N epbrolepis hirsututa .at this time . Eruptions since 1900 have been (Forst. f.) Presl, are among the earliest in­ rnmor. vaders on new lava. Both species were well established on a fresh black aa flow in the VEG ETATION depression at the west base of Mr. Pagan in 1950. This flow has been dated by Tanakadate The present-day vegetation of Pagan gives (1940) as having occurred in 1925. It shows a general impression of semi-aridity . This is no visible weathering. probably not so much a reflection of climatic On plains of ash soil the vegetation is gen- Fossil Flora from Pagan - FOSBERG AND CORWIN 5 erally grassland with scattered trees or clumps Impressions of tree trunks were observed of trees. The trees may be Pandanus, Casuarina, near the base of the upper breccias at several or any of a number of broad-leafed species. places (Fig. 2). In all cases the impressions Many of these areas were under cultivation are nearly horizontal and therefore represent before World War II and are weedy and have fallen branches and trunks. M any are oriented rows of Casuarina and other trees planted by about parallel to radii from Mt. Pagan, sug­ the J apanese as windbreaks. Jatropha gossypi­ gesting that a powerful explosion from the folia 1., a fleshy-stemmed shrub introduced mountain felled,the trees. by the J apanese in the 1930's, has spread and now dominates large areas in the central part THE FOSSIL PLANTS of the island . Clumps oftrees ofvarious kinds Almost the entire collection consists ofleaf mark the sites of houses, still existing or not. impressions, mos t ofthem fragmentary. Some On the gently sloping northwest part of the ofthese have no features preserved that would island is a large coconut plantation. There are make possible even tentative determinations. smaller ones in many part s of the island , both Very careful scrutiny shows that in the entire on plains and on talus cones .Coconuts are also common in ravine mouths and on steep slopes above the sea.
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