Издательство «Фəн» Казань, Татарстан Главный редактор Член-корреспондент АН РТ Ф.Ш. Хузин Заместители главного редактора: доктор исторических наук А.Г. Ситдиков доктор исторических наук Ю.А. Зеленеев Ответственный секретарь-кандидат ветеринарных наук Г.Ш. Асылгараева Редакционный совет: Р.С. Хакимоввице-президент АН РТ (Казань, Россия) (председатель) Х.А. Амирхановчлен-корреспондент РАН, доктор исторических наук, профессор (Махачкала, Россия) И. Бальдауфдоктор наук, профессор (Берлин, Германия) П. Георгиевдоктор наук, доцент (Шумен, Болгария) Е.П. Казаковдоктор исторических наук (Казань, Россия) Н.Н. Крадинчлен-корреспондент РАН, доктор исторических наук, профессор (Владивосток, Россия) А. Тюрк-PhD (Будапешт, Венгрия) И. Фодордоктор исторических наук, профессор (Будапешт, Венгрия) В.Л. Янинакадемик РАН, доктор исторических наук профессор (Москва, Россия) Редакционная коллегия: А.А. Выборнов-доктор исторических наук, профессор (Самара, Россия) М.Ш. Галимова-кандидат исторических наук (Казань, Россия) Р.Д. Голдина-доктор исторических наук, профессор (Ижевск, Россия) И.Л. Измайлов-кандидат исторических наук (Казань, Россия) С.В. Кузьминых-кандидат исторических наук (Москва, Россия) А.Е. Леонтьев-доктор исторических наук (Москва, Россия) Т.Б. Никитина-доктор исторических наук (Йошкар-Ола, Россия) Ответственный за выпуск: Б.Л. Хамидуллинкандидат исторических наук (Казань, Россия)

On July 20th, 2007 Ottawa received 67.8 mm of rainfall, a near record amount for that date. Thirty kilometres to the north in the forested upland of the Canadian Shield, the intense rainfall caused two beaver dams to fail sequentially. The flow descended about 90 m in elevation along a < 1 km long, steep, rock-floored stream before it expanded across a bouldery, vegetated, and inhabited subaerial fan to discharge into Lake McArthur. The flood eroded soil, sediment, and vegetation along the length of the stream. Flow across the subaerial fan inundated one chalet to a depth of 1 m and rafted a smaller building several metres. Expansion bars were deposited at various flow expansion points; however, the most noteworthy deposit is a gravel delta that extends 10 m into the lake. Using a dam break model the peak discharge is estimated at about 70 m3 s-1 which is likely two orders of magnitude greater than average summer discharges. Given the coarseness of the bed material and the small discharge typical of the stream, it is likely that most bed material in the past has been mobilized during similar dam break floods. The study highlights the hazard posed by beaver dams to human infrastructure in steep terrain, and demonstrates that beaver dam outbreak floods can be the predominant agent of geomorphic change in small fluvial systems.

The Beganchik locality is a stratigraphic sequence of loessic deposits, pedogenic horizons and Paleolithic occupations located at the Kama-Volga confluence. The sequence is exposed on a bluff formed on the west side of an erosional remnant between the Kuybyshev Reservoir and the former channel of the Aktay River. Although the site is known for its Terminal Paleolithic-Mesolithic occupations of the Pleistocene-Holocene transition, evidence of older occupations and remains of fauna has been identified. Our research team identified evidence of human presence associated with a pedogenic horizon of MIS 3 age. Two AMS radiocarbon ages from a hearth produced ages around 47 000 years BP. Pollen and phytoliths from two soils horizons, including the one associated with the hearths indicate a steppe environment coincident with the formation of correlative soils elsewhere in the Russian Plain.